KR100380720B1 - A dielectric ceramic composition and multilayer ceramic capacitor using it - Google Patents

Abstract

The present invention relates to a dielectric ceramic composition and a multilayer ceramic capacitor using the same; Its purpose is to use BaCa _x TiO ₃ (0 <x ≤ 0.02) with excellent reduction resistance and to control the diffusion rate of the dielectric ceramic more advantageously, so that the multilayer ceramic having Ni as the internal electrode while satisfying the X7R characteristics and excellent dielectric properties It is to provide a capacitor.

The present invention for achieving the above object, in the dielectric ceramic composition, BaO: 0.1 to 2 mol in the main component of MgO: 0.5 to 4 mol and MnO: 0.01 to 0.5 mol per 100 mol of BaCa _x TiO ₃ (0.005≤x ≤0.02) , CaO: 0.1 ~ 2 mol, and SiO _2: Y ₂ a, and here contains a sintering assistant agent in 1-4 molar O _3, Dy ₂ O _3, Ho ₂ 0 ₃ and Er ₂ O at least one selected from the group consisting of ₃ The technical gist of the paper-based component contained in the range of 0.1 to 3 moles is its technical gist.

Description

Dielectric ceramic composition and multilayer ceramic capacitor using the same {A DIELECTRIC CERAMIC COMPOSITION AND MULTILAYER CERAMIC CAPACITOR USING IT}

The present invention relates to a dielectric ceramic composition and a multilayer ceramic capacitor using the same, and more particularly, to a dielectric ceramic composition having excellent dielectric properties and a multilayer ceramic capacitor having Ni internal electrodes using the same.

In general, as shown in FIG. 1, a multilayer ceramic capacitor is formed by stacking a ceramic dielectric layer 2a and a plurality of ceramic dielectric layers 2a and 2b on which an internal electrode 3 is printed, and at both ends thereof an external electrode 4. This is formed and configured. In order to reduce production costs, multilayer ceramic capacitors having such a structure have recently used base metals such as inexpensive Ni such as Ag and Pd instead of expensive precious metals such as Ag and Pd.

Recently, with the development of electronic technology, miniaturization of electronic components is rapidly progressing, and even in the case of multilayer ceramic capacitors having Ni internal electrodes, a large capacity and temperature stability of capacitance are required. In order for a multilayer ceramic capacitor using Ni as an electrode to satisfy large capacity and miniaturization, the dielectric layer must be further thinned and multilayered. However, when the dielectric layer is thinned, more high voltage is applied to the dielectric material, and when the conventional dielectric material is used, the lowering of the dielectric constant, the increase of the temperature dependence of the capacitance, and the stability of other characteristics often lead to deterioration. In particular, when the thickness of the dielectric layer is reduced to 5 μm or less, the number of ceramic particles between the internal electrodes decreases to 10 or less, making it difficult to assure stable characteristics.

On the other hand, barium titanate has been mostly used as a dielectric composition used in the dielectric layer of a capacitor. However, if barium titanate is fired in a reducing atmosphere, it is semiconducted during firing and loses its insulation resistance. Therefore, if the shell component having reduction resistance is not uniformly formed in all particles in the capacitor, the insulation resistance of the product may decrease and the life may be drastically reduced. Can be. In addition, even if a shell having a large insulation resistance is formed, when the thickness is very thin, the barium titanate in the particles may be semiconductorized to lower the insulation resistance of the product and to drastically reduce the lifetime.

In order to solve this problem, Korean Patent Publication No. 2000-17250 provides a capacitor having a Ni internal electrode using a starting material including barium calcium titanate, which has greatly improved reduction resistance compared to conventional barium titanate. Since barium calcium titanate has reduction resistance due to lattice defects formed by Ca replacing Ti sites, there is an advantage of maintaining high insulation resistance even when a shell is not formed or is thinly formed during the reduction atmosphere firing. The multilayer ceramic capacitor disclosed in the Korean patent publication uses a dielectric composition containing glass oxide as a subsidiary component of a starting material including (Ba _1-x Ca _x ) _m TiO ₂ . A multilayer ceramic capacitor is provided that satisfies the X7R characteristics specified in the standard and uses Ni as the internal electrode. In addition, the dielectric ceramic disclosed in the Republic of Korea Patent (Ba _1-x Ca _x ) _m TiO ₂ Re component (wherein Re is at least one or more selected from Y, Gd, Tb, Dy, Ho, Er and Yb) ), The core-shell structure present near the particle boundary and at the particle boundary is obtained by diffusion during firing.

However, since the multilayer ceramic capacitor uses a glass component as a subsidiary component of the dielectric layer, it is difficult to control the rate at which the composition forming the shell having a high dielectric resistance but a low dielectric constant diffuses into the core, and thus the dielectric ceramic capacitor is used. The problem is that the dielectric properties of the multilayer ceramic capacitor are rather low. In particular, the patent discloses Li ₂ O— (Si, Ti) O ₂ —MO based oxides (wherein MO is at least one selected from Al ₂ O ₃ and ZrO ₂ ), or SiO ₂ —TiO ₂ —XO. Oxide (XO is at least one selected from BaO, CaO, SrO, MgO, ZnO, and MnO), or Li ₂ OB ₂ O _3- (Si, Ti) O ₂ based, Al ₂ O ₃ -MO-B ₂ O Sintering aids, such as _three systems (MO is at least one selected from BaO, CaO, SrO, MgO, ZnO, MnO) and the like are used. However, since these sintering aids form a liquid phase at a low temperature, almost all of them exhibit a dielectric constant of less than 2000, which does not provide a reliable large capacity multilayer ceramic capacitor.

Accordingly, the present invention is proposed to solve such a conventional problem, by using BaCa _x TiO ₃ (0 <x ≤ 0.02) excellent in the resistance to reduction and by more advantageous to control the diffusion rate of the dielectric ceramic, satisfies the X7R characteristics Yet another object of the present invention is to provide a multilayer ceramic capacitor having Ni as an internal electrode having excellent dielectric properties.

1 is a cross-sectional view of a multilayer ceramic capacitor

Figure 2 is an exploded perspective view of the ceramic dielectric layer of Figure 1

Explanation of symbols on the main parts of the drawings

1 ..... multilayer ceramic capacitors 2a, 2b ..... ceramic dielectric layer

3 ..... Internal Electrode 4 ........... External Electrode

In the present invention for achieving the above object, in the dielectric ceramic composition,

BaCa _x TiO ₃ (0.001≤x ≤0.02) per 100 moles of MgO: 0.5-4 mol and MnO: 0.01-0.5 mol, BaO: 0.1-2 mol, CaO: 0.1-2 mol and SiO ₂ : 1-4 A dielectric comprising a molar sintering aid, wherein at least one or more components selected from the group consisting of Y ₂ O ₃ , Dy ₂ O ₃ , Ho ₂ 0 ₃ and Er ₂ O ₃ are contained in the range of 0.1 to 3 moles; It relates to a ceramic composition.

The present invention may contain V ₂ O ₅ and Cr ₂ O ₃ in an amount of 0.4 mole or less alone or in combination in the above dielectric ceramic composition.

In addition, the present invention provides a dielectric layer comprising a ceramic dielectric composition having the above composition, an internal dielectric layer including a plurality of Ni internal electrodes existing between the dielectric layers, and a plurality of dielectric layers electrically connected to the plurality of internal dielectric layers. The present invention relates to a multilayer ceramic capacitor including external electrodes formed at both ends.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

In the dielectric ceramic composition of the present invention, a Ba component, a Ca component, and a Si component are added to a main component system composed of BaCa _x TiO ₃ , MgO, and MnO, and Y ₂ O ₃ , Dy ₂ O ₃ , and Ho ₂ are added thereto. It is characterized by containing at least one component selected from the group consisting of 0 ₃ and Er ₂ O ₃ .

The dielectric composition of the present invention uses barium calcium titanate, which forms a core-shell structure, to improve dielectric properties than conventional barium titanate. Furthermore, the present invention diffuses Ba, Ca, Si and the like into the shell portion of barium calcium titanate at an appropriate firing temperature, while greatly improving insulation resistance than adding glass frit as a raw material of barium calcium titanate. A dielectric composition having X7R properties is provided.

To this end, in BaCa _x TiO ₃ which is the main raw material of the present invention, x is preferably used having a range of 0.001 to 0.02.

MgO component, which is one of the main components of the present invention, serves to satisfy the X7R characteristic by the change in the capacitor capacity according to temperature, but when it is added too little, the X7R characteristic cannot be satisfied, and the change in the capacitor capacity becomes large, Firing becomes difficult. For this reason, the MgO component is preferably added within the range of 0.5 to 4 mol based on 100 mol of barium calcium titanate. More preferably, the MgO component is added within the range of 0.5 to 3 mol based on 100 mol of barium calcium titanate.

In addition, the action of the MnO component capacitor with the change in the insulation resistance and capacitance over time, if too small addition, the insulation resistance of the capacitor is lowered, if a large amount is added, the change in the capacitor capacity is not only large, but also difficult to fire. For the above reason, the MnO content is suitably added within the range of 0.01 to 0.5 mol per 100 mol of barium calcium titanate. More preferably, MnO content is added in the range of 0.05-0.2 mol per 100 mol of barium calcium titanate.

BaO, a component that promotes sintering of the dielectric composition of the present invention, serves to control the rate at which the shell-forming compositions diffuse into the barium calcium titanate, and remains together in the shell portion to greatly improve dielectric resistance as well as dielectric properties. In the present invention, the BaO content is suitably added within the range of 0.1 to 2.0 mol per 100 mol of barium calcium titanate. If the content of BaO is small, the insulation resistance of the capacitor is lowered. If the content of BaO is large, the firing of the capacitor is not preferable. More preferably, the BaO content is added within the range of 0.5 to 1.5 mol per 100 mol of barium calcium titanate.

In the dielectric ceramic composition of the present invention, CaO is preferably added as a sintering aid together with BaO and SiO ₂ . CaO plays a role in controlling the rate at which the shell-forming compositions with BaO diffuse into the barium calcium titanate, and remain together in the shell portion to not only improve dielectric properties but also greatly improve insulation resistance. At this time, the CaO is suitably added in the range of 0.1 to 2.0 mol per 100 mol of calcium barium titanate. If a small amount of CaO is added, the insulation resistance of the capacitor is lowered, and if a large amount of CaO is added, it is not preferable because plasticity of the capacitor is difficult. More preferably, the CaO content is added in the range of 0.5 to 1.5 mol per 100 mol of barium calcium titanate.

One of the other sintering aids, the SiO ₂ component, serves to carry and retain the shelled composition in the shell portion of the barium calcium titanate. The content of SiO ₂ is suitably added within the range of 1 to 4 mol per 100 mol of barium calcium titanate. If a small amount of SiO ₂ is added, the firing of the capacitor is difficult, and if a large amount is added, the insulation resistance of the capacitor is lowered, which is not preferable. More preferably, the content of SiO ₂ is added within the range of 1.5 to 3 mol per 100 mol of barium calcium titanate.

Components of the Y ₂ O contained in the dielectric ceramic composition of the invention _{3, Dy 2 O 3, Ho} 2 0 3 or Er ₂ O ₃ will contribute to extending the accelerated life of the capacitor. Each of the above components is preferably added in the range of 0.1 to 3 moles based on 100 moles of barium calcium titanate. If less components are added, the life of the capacitor is shorter and the DC bias characteristics are worse. If more components are added, the dielectric constant is not only lowered but also difficult to fire. More preferably, the components are each added within the range of 0.5 to 2 mol per 100 mol of barium calcium titanate.

In addition, in the dielectric ceramic composition of the present invention, the V ₂ O ₅ and Cr ₂ O ₃ components reduce the change of capacitor capacity with time. In the present invention, the V ₂ O ₅ and Cr ₂ O ₃ may be contained alone or in combination at 0.4 mol or less per 100 mol of barium calcium titanate. If more V ₂ O ₅ and Cr ₂ O ₃ are added, the insulation resistance of the capacitor is significantly lowered. More preferably, the V ₂ O ₅ and Cr ₂ O ₃ alone or in combination are contained in the range of 0.05 to 0.3 mol per 100 mol of barium calcium titanate.

The dielectric composition of the present invention composed of such components and compositions can easily control diffusion in the shell of the dielectric layer, thereby greatly improving the dielectric properties. Therefore, a large-capacity multilayer ceramic capacitor manufactured using the dielectric ceramic composition of the present invention may not only greatly improve the insulation resistance while satisfying the X7R characteristic but also exhibit a dielectric constant of at least 2000 or more.

Hereinafter, the manufacturing process of the multilayer ceramic capacitor according to the present invention will be described in detail.

In the multilayer ceramic capacitor of the present invention, first, the above-described dielectric ceramic raw material powder is prepared, the prepared raw material powder is mixed at a predetermined composition ratio, and then, an organic binder is added to the mixed powder to slurry. The slurry is molded into a sheet to prepare a green sheet. Next, an internal electrode is formed of Ni or a Ni-based alloy on one surface of the green sheet, and the green sheet having the internal electrode is laminated as many as necessary. The laminate is formed by alternately stacking and pressing a dielectric layer on which the internal electrodes are formed and a dielectric layer on which the internal electrodes are not formed. When the laminate is fired at a predetermined temperature in a reducing atmosphere, a ceramic chip can be obtained. Thereafter, a pair of external electrodes are formed at both ends of the chip so as to be electrically connected to the internal electrodes. In general, the external electrode is formed by baking or baking after applying the metal powder paste on both ends of the chip.

Hereinafter, the present invention will be described in detail through examples.

Example 1

Each powder was mixed at a rate of 1 mol of BaCO ₃ , 0.001 mol of CaCO ₃ , and 1 mol of TiO _{2 having a} purity of 99.5% or more, and then calcined at 1000 ° C. to 1200 ° C. for 2 hours to obtain barium calcium titanate (x = 0.001).

Subsidiary materials were added to 100 mol of the barium calcium titanate in the same ratio as in Table 1, and a polyvinyl butyral binder and a solvent such as ethanol were added thereto to make a slurry.

division Chemical composition (mol%) MgO MnO BaO CaO SiO ₂ Y ₂ O ₃ V ₂ O ₅ Cr ₂ O ₃ Comparative material a 2 0.1 0.5 - 2 1.0 0.07 0.2 Comparative material b 2 0.1 1.0 - 2 1.0 0.07 0.2 Invention 1 2 0.1 0.5 0.5 2 1.0 0.07 0.2 Invention 2 2 0.1 0.5 1.0 2 1.0 0.07 0.2 Invention 3 2 0.1 1.0 1.0 2 1.0 0.07 0.2

After the slurry was molded into a sheet having a thickness of 20 µm, Ni internal electrodes were printed on the molded sheet, and 40 layers were stacked to prepare chips. Then, after removing the part of the binder by heat-treating the prepared chip at 230 ~ 320 ℃, the heat-treated chip was fired for 2 hours at a temperature between 1250 ℃ to 1350 ℃. During firing, the Ni electrode was not oxidized by using a mixed gas of nitrogen, hydrogen, and water vapor. Then, the calcined chip was heat treated at a temperature of 900 ° C to 1100 ° C. Thereafter, both ends of the manufactured chip were polished, and external electrodes were applied to both ends of the chip to prepare a multilayer ceramic capacitor. The multilayer ceramic capacitor thus prepared was subjected to capacitance, insulation resistance, capacity change with temperature, accelerated life test, and time-dependent change test, and the results are shown in Table 2.

The capacitance was measured by applying an AC 1V of 1kHz at room temperature using an LCR meter, and the insulation resistance was measured by applying 50V, which is a DC rated voltage of the product, for 10 seconds.

In addition, the change in capacity according to temperature was measured by applying an alternating current of 1 kHz of 1 kHz using an LCR meter while changing the temperature from -55 ° C to 125 ° C.

Acceleration life was calculated by applying 400V, which is eight times the rated voltage at 125 ° C, to 40 samples.

On the other hand, the change in capacity over time was calculated by dividing the change in capacity after applying the rated voltage to the product at 40 ° C. for 1000 hours by the initial capacity value.

division permittivity Insulation Resistance Acceleration Life (hr) Change over time (%) X7R characteristics Comparative material a 3680 Reduced 0 - × Comparative material b 3105 244 0.503 - × Invention 1 2674 7146.7 158.5 -2.3 satisfied Invention 2 2315 7905.7 185.4 -2.7 satisfied Invention 3 2492 7263.3 145.1 -2.5 satisfied

As can be seen from Table 2, the multilayer ceramic capacitor according to the present invention satisfies the X7R characteristic specification defined by the EIA standard, but has a very high insulation resistance, and in particular, has a dielectric constant of 2000 or more and an acceleration life of 150 hours or more.

Example 2

Each powder was mixed at a ratio of 1 mol of BaCO ₃ , 0.005 mol of CaCO ₃ , and 1 mol of TiO _{2 having a} purity of 99.5% or more, and then calcined at 1000 ° C. to 1200 ° C. for 2 hours to obtain barium calcium titanate (x = 0.005).

The additives were added to 100 mol of the barium calcium titanate in the same ratio as in Table 3 to prepare a multilayer ceramic capacitor in the same manner as in Example 1, and then the characteristics of the prepared capacitors were measured, and the results are shown in Table 4. .

division Chemical composition (mol%) MgO MnO BaO CaO SiO ₂ Y ₂ O ₃ Dy ₂ O ₃ Ho ₂ O ₃ Er ₂ O ₃ V ₂ O ₅ Cr ₂ O ₃ Invention 4 2 0.1 0.5 0.1 2 1.0 - - - 0.07 0.2 Invention 5 2 0.1 1.0 0.1 2 1.0 - - - 0.07 0.2 Invention 6 2 0.1 0.5 0.5 2 1.0 - - - 0.07 0.2 Invention 7 2 0.1 0.5 1.0 2 0.5 - - - 0.07 0.2 Invention Material 8 2 0.1 1.0 1.0 2 - 1.0 - - 0.07 0.2 Invention Material 9 2 0.1 0.5 0.5 2 - 1.5 - - 0.07 0.2 Invention 10 2 0.1 0.5 0.5 2 - - 1.0 - 0.07 0.2 Invention 11 2 0.1 0.5 0.5 2 - - 1.5 - 0.07 0.2 Invention Material12 2 0.1 0.5 0.5 2 - - - 1.0 0.07 0.2 Invention Material 13 2 0.1 0.5 0.5 2 - - - 1.5 0.07 0.2

division permittivity Insulation Resistance Acceleration Life (hr) Change over time (%) X7R characteristics Invention 4 2656 7183 157.3 -2.4 satisfied Invention 5 2783 7059.8 107.8 -3.1 satisfied Invention 6 2691 7075.2 112.3 -3.0 satisfied Invention 7 2613 6585.3 98.7 -3.1 satisfied Invention Material 8 3127 6932.8 85.1 -3.5 satisfied Invention Material 9 2495 6985.1 97.5 -3.2 satisfied Invention 10 2981 4153.7 123.1 -2.9 satisfied Invention 11 2704 7351.8 137.0 -2.6 satisfied Invention Material12 2697 7104.6 83.9 -3.5 satisfied Invention Material 13 2284 6823.3 79.5 -3.6 satisfied

As can be seen from Table 4, the multilayer ceramic capacitor according to the present invention satisfies the X7R characteristic specification defined by the EIA standard, but has a very high insulation resistance, and in particular, has a dielectric constant of 2000 or more and an acceleration life of 79 hours or more.

Example 3

Each powder was mixed at a ratio of 1 mol of BaCO ₃ , 0.01 mol of CaCO ₃ , and 1 mol of TiO _{2 having a} purity of 99.5% or more, and then calcined at 1000 ° C. to 1200 ° C. for 2 hours to obtain barium calcium titanate (x = 0.01).

Subsidiary materials were added to 100 mol of the barium calcium titanate in the ratio as shown in Table 5, PVB-based binder and solvent were added thereto to make a slurry, and then a multilayer ceramic capacitor was manufactured in the same manner as in Example 1, and then the capacitor was manufactured. The properties were measured for and the results are shown in Table 6.

division Chemical composition (mol%) MgO MnO BaO CaO SiO ₂ Y ₂ O ₃ Dy ₂ O ₃ Ho ₂ O ₃ Er ₂ O ₃ V ₂ O ₅ Cr ₂ O ₃ Comparative material c 2 - 0.5 0.1 2 1.0 - - - 0.07 0.2 Comparative material 2 0.1 0.5 0.1 2 - - - - 0.07 0.2 Invention 14 2 0.1 0.5 0.1 2 1.0 - - - 0.07 0.2 Invention Material 15 2 0.1 0.5 0.5 2 1.0 - - - 0.07 0.2 Invention Material 16 One 0.1 0.5 0.1 2 1.0 - - - 0.07 0.2 Invention 17 4 0.1 0.5 0.1 2 1.0 - - - 0.07 0.2 Invention 18 2 0.05 0.5 0.1 2 1.0 - - - 0.07 0.2 Invention Material 19 2 0.2 0.5 0.1 2 1.0 - - - 0.07 0.2 Invention 20 2 0.1 0.5 0.1 2 0.5 - - - 0.07 0.2 Inventive Materials21 2 0.1 0.5 0.1 2 2.0 - - - 0.07 0.2 Invention 22 2 0.1 0.5 0.1 2 1.0 - - - - 0.2 Invention 23 2 0.1 0.5 0.1 2 1.0 - - - 0.2 0.2 Invention 24 2 0.1 0.5 0.1 2 1.0 - - - 0.4 0.2 Invention 25 2 0.1 0.5 0.1 2 1.0 - - - 0.07 - Invention 26 2 0.1 0.5 0.1 2 1.0 - - - 0.07 0.4 Invention Material27 2 0.1 0.5 0.1 2 - 1.0 - - 0.07 0.2 Invention Material 28 2 0.1 0.5 0.1 2 - 1.5 - - 0.07 0.2 Invention 29 2 0.1 0.5 0.1 2 - - 1.0 - 0.07 0.2 Invention Material 30 2 0.1 0.5 0.1 2 - - 1.5 - 0.07 0.2 Invention 31 2 0.1 0.5 0.1 2 - - - 1.0 0.07 0.2 Inventive Materials32 2 0.1 0.5 0.1 2 - - - 1.5 0.07 0.2

division permittivity Insulation Resistance Acceleration Life (hr) Change over time (%) X7R characteristics Comparative material c 2944 315.7 0.581 - satisfied Comparative material 2465 2567.3 6.9 - satisfied Invention 14 2702 7099.4 168.5 -2.2 satisfied Invention Material 15 2489 7034.5 121.1 -2.9 satisfied Invention Material 16 3139 5390.0 131.3 -2.7 satisfied Invention 17 2518 7814.4 144.5 -2.5 satisfied Invention 18 2616 4482.5 133.0 -2.7 satisfied Invention Material 19 2587 8900.1 133.7 -2.7 satisfied Invention 20 2645 6761.7 132.3 -2.7 satisfied Inventive Materials21 2691 7324.9 172.4 -2.1 satisfied Invention 22 2599 5958.6 90.8 -3.2 satisfied Invention 23 2702 7052.1 89.7 -3.4 satisfied Invention 24 2645 6969.6 120.9 -3.0 satisfied Invention 25 2656 4479.2 59.7 -3.9 satisfied Invention 26 2639 7034.5 108.3 -3.0 satisfied Invention Material27 3115 7008.5 90.4 -3.3 satisfied Invention Material 28 2492 6857.0 98.2 -3.1 satisfied Invention 29 2859 4307.9 119.8 -3.0 satisfied Invention Material 30 2715 7348.1 148.6 -2.4 satisfied Invention 31 2690 7086.4 90.8 -3.2 satisfied Inventive Materials32 2197 6905.0 88.1 -3.4 satisfied

As can be seen from Table 6, the multilayer ceramic capacitor according to the present invention satisfies the X7R characteristic specification defined by the EIA standard, but has a very high insulation resistance, particularly a dielectric constant of 2000 or more, and an acceleration life of 60 hours or more.

Example 4

Each powder was mixed at a ratio of 1 mol of BaCO ₃ , 0.02 mol of CaCO _{3 and} 1 mol of TiO _{2 having a} purity of 99.5% or more, and then calcined at 1000 ° C. to 1200 ° C. for 2 hours to obtain barium calcium titanate (x = 0.02).

Subsidiary materials were added to 100 mol of the barium calcium titanate in the ratio as shown in Table 7, PVB-based binder and solvent were added thereto to make a slurry, and a multilayer ceramic capacitor was manufactured in the same manner as in Example 1 The properties were measured for and the results are shown in Table 8.

division Chemical composition (mol%) MgO MnO BaO CaO SiO ₂ Y ₂ O ₃ V ₂ O ₅ Cr ₂ O ₃ Invention Material 33 2 0.1 0.5 0.1 2 1.0 0.07 0.2

division permittivity Insulation Resistance Acceleration Life (hr) Change over time (%) X7R characteristics Invention Material 33 2339 8581.1 73.6 -3.7 satisfied

As can be seen from Table 8, the multilayer ceramic capacitor according to the present invention satisfies the X7R characteristic standard defined by the EIA standard, but has a very high insulation resistance, and in particular, has a dielectric constant of 2000 or more and an acceleration life of 70 hours or more.

As described above, the present invention uses BaCa _x TiO ₃ (0 <x ≤ 0.02) having excellent reduction resistance and more advantageously controls the diffusion rate of the dielectric ceramic, thereby satisfying the X7R characteristics but having excellent dielectric properties. There is an effect of providing a multilayer ceramic capacitor as an electrode.

Claims (10)

In a dielectric ceramic composition, Per 100 moles of BaCa _x TiO ₃ (0.001≤x ≤0.02), MgO: 0.5-4 mol, MnO: 0.01-0.5 mol, BaO: 0.1-2 mol, CaO: 0.1-2 mol, SiO ₂ : 1-4 mol, and Y ₂ O ₃ , Dy ₂ O ₃ , Ho ₂ 0 At least one component selected from the group consisting of ₃ and Er ₂ O ₃ : a dielectric ceramic composition containing from 0.1 to 3 moles The dielectric ceramic composition of claim 1, wherein the MgO is contained in a range of 0.5 to 3 mol per 100 mol of barium calcium titanate. The dielectric ceramic composition of claim 1, wherein the MnO is contained in a range of 0.05 to 0.2 mol per 100 mol of barium calcium titanate. The dielectric ceramic composition according to claim 1, wherein the BaO is contained in a range of 0.5 to 1.5 moles per 100 moles of barium calcium titanate. The dielectric ceramic composition of claim 1, wherein the CaO is contained in a range of 0.5 to 1.5 moles per 100 moles of barium calcium titanate. The dielectric ceramic composition of claim 1, wherein the SiO ₂ is contained in a range of 1.5 to 3 mol per 100 mol of barium calcium titanate. The method of claim 1, wherein at least one component selected from the group consisting of Y ₂ O ₃ , Dy ₂ O ₃ , Ho ₂ 0 _3, and Er ₂ O ₃ is contained in a range of 0.5 to 2 moles, respectively. Dielectric ceramic composition The dielectric ceramic composition of claim 1, wherein the composition further contains 0.4 mol or less of V ₂ O ₅ and Cr ₂ O ₃ , alone or in combination. The dielectric ceramic composition according to claim 8, wherein the V ₂ O ₅ and Cr ₂ O ₃ are contained alone or in a combination of 0.05 to 0.3 moles. 10. An internal dielectric layer comprising a plurality of dielectric layers comprising the ceramic dielectric composition of any one of claims 1 to 9, and a plurality of Ni or Ni-based internal electrodes present between the dielectric layers, and the plurality of internal dielectric layers. And an external electrode electrically connected to the external electrodes formed at both ends of the dielectric layer.