JPS6255244B2 - - Google Patents
Info
- Publication number
- JPS6255244B2 JPS6255244B2 JP55060900A JP6090080A JPS6255244B2 JP S6255244 B2 JPS6255244 B2 JP S6255244B2 JP 55060900 A JP55060900 A JP 55060900A JP 6090080 A JP6090080 A JP 6090080A JP S6255244 B2 JPS6255244 B2 JP S6255244B2
- Authority
- JP
- Japan
- Prior art keywords
- main component
- composition
- temperature
- atomic
- sintering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000000203 mixture Substances 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 13
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 3
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims 2
- NKTZYSOLHFIEMF-UHFFFAOYSA-N dioxido(dioxo)tungsten;lead(2+) Chemical compound [Pb+2].[O-][W]([O-])(=O)=O NKTZYSOLHFIEMF-UHFFFAOYSA-N 0.000 claims 1
- 238000005245 sintering Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000010955 niobium Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910052788 barium Inorganic materials 0.000 description 1
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- BDAGIHXWWSANSR-NJFSPNSNSA-N hydroxyformaldehyde Chemical compound O[14CH]=O BDAGIHXWWSANSR-NJFSPNSNSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 229910052763 palladium Inorganic materials 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 229910000018 strontium carbonate Inorganic materials 0.000 description 1
- ZNOKGRXACCSDPY-UHFFFAOYSA-N tungsten trioxide Chemical compound O=[W](=O)=O ZNOKGRXACCSDPY-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Magnetic Ceramics (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Ceramic Capacitors (AREA)
- Inorganic Insulating Materials (AREA)
Description
本発明は、磁気組成物、特に高誘電率で焼結温
度の低い磁気組成物に関する。
従来高誘電率系誘電体として、チタン酸バリウ
ム〔BaTiO3〕を主成分とするものが広く実用化さ
れていることは周知のとおりである。しかしなが
らBaTiO3を主成分とするものは焼結温度が通常
1300℃〜1400℃の高温であり、特に積層型コンデ
ンサの場合には、この焼結温度に適した内部電極
として、主成分が白金またはパラジウム等の高価
な貴金属を使用しなければならないという欠点を
有していた。
このため銀等を主成分とする安価な内部電極を
使用可能とするためには、焼結温度ができるだけ
低温、特に1000℃以下の温度で焼結できる誘電体
が強く要望されていた。
本発明の目的は、1000℃以下の温度で焼結で
き、誘電率が著るしく高く、かつ誘電損失が小さ
く、しかも比抵抗の高い組成物を提供することに
ある。
本発明者等は既に1000℃以下で焼結できるPb
（Fe〓Ｗ〓）O3とPb（Fe〓Nb〓）O3からなる二
成分系高誘電率磁器組成物を提案した（特開昭52
−87700）。この組成物は優れた誘電特性を有して
おり磁器コンデンサとして実用化されようとして
いる。しかしながら誘電損失や比抵抗がやや不満
足であり、用途は自ら狭い範囲に限定せざるを得
なかつた。
本発明は、この二成分系組成物をPb（Fe〓Ｗ
〓）ｘ（Fe〓Nb〓）1-xO3と表わしたとき配合比
ｘが0.2≦ｘ≦0.5の範囲内にある主成分組成物に
副成分として少なくとも１種類以上のアルカリ土
類金属元素を0.02〜２原子％含有せしめることに
よつて高誘電率を保ち、かつ誘電損失を減少さ
せ、しかも比抵抗を増大せしめ、量産性に富む、
安価で優れた高誘電率磁器組成物を提供するもの
である。
以下本発明を実施例により詳細に説明する。
実施例
出発原料として、酸化鉛（PbO）、酸化鉄
（Fe2O3）、酸化タングステン（WO3）、酸化ニオ
ブ（Nb2O5）、炭酸カルシウム（CaCO3）、炭酸ス
トロンチウム（SrCO3）、炭酸バリウム
（BaCO3）を使用し、所定の配合比に秤量する。
次に、ボールミル中で湿式混合した後750℃〜850
℃で予焼を行い、この粉末を粉砕した後、約
0.7ton／cm2の圧力で、直径約16mm、厚さ約10mmの
円柱に加圧成型した後、880℃〜980℃で焼結し
た。得られた焼結体を約0.5mmの円板に切断した
後、銀電極を焼付けた。このようにして得られた
磁気組成物の配合比と諸特性の関係を表に示す。
The present invention relates to magnetic compositions, particularly magnetic compositions with high dielectric constants and low sintering temperatures. It is well known that as a conventional high permittivity dielectric material, a material containing barium titanate [BaTiO 3 ] as a main component has been widely put into practical use. However, for materials whose main component is BaTiO 3 , the sintering temperature is usually
The high temperature is 1300°C to 1400°C, and especially in the case of multilayer capacitors, the drawback is that an expensive noble metal such as platinum or palladium must be used as the main component for the internal electrode suitable for this sintering temperature. had. Therefore, in order to make it possible to use inexpensive internal electrodes mainly composed of silver or the like, there has been a strong demand for a dielectric material that can be sintered at as low a sintering temperature as possible, particularly at a temperature of 1000° C. or lower. An object of the present invention is to provide a composition that can be sintered at a temperature of 1000°C or lower, has a significantly high dielectric constant, low dielectric loss, and high specific resistance. The inventors have already discovered that Pb can be sintered at temperatures below 1000℃.
We proposed a binary high permittivity ceramic composition consisting of (Fe〓W〓)O 3 and Pb(Fe〓Nb〓)O 3 (Japanese Unexamined Patent Application Publication No. 1989-1995).
−87700). This composition has excellent dielectric properties and is about to be put into practical use as a ceramic capacitor. However, the dielectric loss and resistivity were somewhat unsatisfactory, and the application had to be limited to a narrow range. The present invention uses this two-component composition as Pb(Fe〓W
〓) x (Fe〓Nb〓) 1-x O 3 When the compounding ratio x is within the range of 0.2≦x≦0.5, at least one alkaline earth metal element is added as a subcomponent to the main component composition. By containing 0.02 to 2 atomic percent of
The present invention provides an inexpensive and excellent high dielectric constant ceramic composition. The present invention will be explained in detail below with reference to Examples. Examples Starting materials include lead oxide (PbO), iron oxide (Fe 2 O 3 ), tungsten oxide (WO 3 ), niobium oxide (Nb 2 O 5 ), calcium carbonate (CaCO 3 ), and strontium carbonate (SrCO 3 ). , barium carbonate (BaCO 3 ) is used and weighed to a predetermined mixing ratio.
Then, after wet mixing in a ball mill 750℃~850℃
After pre-calcining at ℃ and pulverizing this powder, approx.
It was pressure-molded into a cylinder with a diameter of about 16 mm and a thickness of about 10 mm at a pressure of 0.7 ton/cm 2 , and then sintered at 880°C to 980°C. The obtained sintered body was cut into disks of about 0.5 mm, and then silver electrodes were baked onto them. The relationship between the blending ratio and various properties of the magnetic composition thus obtained is shown in the table.
【表】【table】
【表】
表によつて明らかなように、副成分として、ア
ルカリ土類金属元素の中から少なくとも一つ以上
の金属元素を含有せしめることにより、高誘電率
を保ち、かつ誘電損失を減少せしめ、しかも比低
抗を著しく高めて、実用性に富む優れた高誘電率
磁器組成物が得られることがわかる。焼結温度が
1000℃以下の低温であるため、焼結に伴う材の
耐久性の著るしい向上や電力費用の低減等による
製造コストの低下はいうに及ばず、特に大容量積
層コンデンサの内部電極の低価格化を実現できる
という極めて量産性に富む材料を提供するもので
ある。
なお主成分配合比ｘが0.2未満あるいは0.5を超
える範囲の組成物は、キユリー点が室温より高温
側あるいは低温側に大きくずれるため室温での誘
電率が低くなる。また副成分であるCa，Sr，Ba
の中から一つ以上の金属元素の含有量が0.02原子
％未満では、誘電損失や比抵抗の改善効果が小さ
く、2.0原子％を超えると誘電損失が大きくな
る。
なお、上記実施例では使用原料は主として酸化
物を用いたが、焼結することによつて容易に酸化
物となる原料たとえば炭酸塩を用いても同等の効
果が得られることは言うまでもない。[Table] As is clear from the table, by containing at least one metal element among alkaline earth metal elements as a subcomponent, a high dielectric constant can be maintained and dielectric loss can be reduced. Moreover, it can be seen that an excellent high-permittivity ceramic composition with excellent practicality can be obtained by significantly increasing the specific resistance. Sintering temperature
Because the temperature is below 1000℃, it not only significantly improves the durability of the material due to sintering and lowers manufacturing costs due to reduced electricity costs, but also lowers the price of internal electrodes for large-capacity multilayer capacitors. This provides a material that is highly mass-producible and can be used to produce a variety of materials. In addition, a composition in which the main component blending ratio x is less than 0.2 or more than 0.5 has a low dielectric constant at room temperature because the Curie point is largely shifted to a higher temperature side or a lower temperature side than room temperature. In addition, the subcomponents Ca, Sr, Ba
If the content of one or more of the metal elements is less than 0.02 atomic%, the effect of improving dielectric loss and resistivity will be small, and if it exceeds 2.0 atomic%, dielectric loss will increase. Although oxides were mainly used as raw materials in the above embodiments, it goes without saying that the same effect can be obtained by using raw materials that easily become oxides by sintering, such as carbonates.
Claims (1)
O3〕および鉄・ニオブ酸鉛〔Pb（Fe〓Nb〓）
O3〕からなる二成分組成物をPb（Fe〓Ｗ〓）ｘ
（Fe〓Nb〓）1-xO3と表わしたときに配合比ｘが
0.2≦ｘ≦0.5の範囲内にある主成分組成物に副成
分として少くとも一つ以上のアルカリ土類金属元
素を前記主成分組成物に対して、0.02原子％以上
２原子％以下含有せしめたことを特徴とする高誘
電率磁気組成物。[Claims] 1. Iron/lead tungstate [Pb (Fe〓W〓)
O 3 ] and iron/lead niobate [Pb (Fe〓Nb〓)
Pb( Fe〓W〓 )x
(Fe〓Nb〓) When expressed as 1-x O 3 , the compounding ratio x is
The main component composition within the range of 0.2≦x≦0.5 contains at least one alkaline earth metal element as a subcomponent, based on the main component composition, from 0.02 atomic % to 2 atomic %. A high dielectric constant magnetic composition characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6090080A JPS56156609A (en) | 1980-05-08 | 1980-05-08 | High dielectric constant magnetic composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6090080A JPS56156609A (en) | 1980-05-08 | 1980-05-08 | High dielectric constant magnetic composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56156609A JPS56156609A (en) | 1981-12-03 |
| JPS6255244B2 true JPS6255244B2 (en) | 1987-11-19 |
Family
ID=13155685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6090080A Granted JPS56156609A (en) | 1980-05-08 | 1980-05-08 | High dielectric constant magnetic composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56156609A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59181407A (en) * | 1983-03-31 | 1984-10-15 | 株式会社東芝 | High dielectric porcelain composition |
| TW239892B (en) * | 1993-05-20 | 1995-02-01 | Tdk Electronics Co Ltd | |
| JPH10231173A (en) * | 1996-12-16 | 1998-09-02 | Tdk Corp | Dielectric porcelain composition, dielectric porcelain material and its production, and dielectric element and its production |
-
1980
- 1980-05-08 JP JP6090080A patent/JPS56156609A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56156609A (en) | 1981-12-03 |
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