JP7276663B2 - 誘電体組成物および電子部品 - Google Patents
誘電体組成物および電子部品 Download PDFInfo
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- JP7276663B2 JP7276663B2 JP2019238933A JP2019238933A JP7276663B2 JP 7276663 B2 JP7276663 B2 JP 7276663B2 JP 2019238933 A JP2019238933 A JP 2019238933A JP 2019238933 A JP2019238933 A JP 2019238933A JP 7276663 B2 JP7276663 B2 JP 7276663B2
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- 239000000203 mixture Substances 0.000 title claims description 47
- 238000005204 segregation Methods 0.000 claims description 80
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- 239000011575 calcium Substances 0.000 claims description 65
- 229910018557 Si O Inorganic materials 0.000 claims description 48
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 claims description 48
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 28
- 229910052791 calcium Inorganic materials 0.000 claims description 28
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 21
- 229910052710 silicon Inorganic materials 0.000 claims description 21
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- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 7
- 229910052719 titanium Inorganic materials 0.000 claims description 7
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- VSZWPYCFIRKVQL-UHFFFAOYSA-N selanylidenegallium;selenium Chemical compound [Se].[Se]=[Ga].[Se]=[Ga] VSZWPYCFIRKVQL-UHFFFAOYSA-N 0.000 description 4
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
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- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
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- 239000011229 interlayer Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
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- 238000004519 manufacturing process Methods 0.000 description 2
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- 235000009566 rice Nutrition 0.000 description 2
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- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001252 Pd alloy Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
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- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 description 1
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- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
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- 239000003989 dielectric material Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
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- 238000006386 neutralization reaction Methods 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
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- 238000010998 test method Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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Description
主相と、Ca-RE-Si-O偏析相と、を含む誘電体組成物であって、
前記主相はABO3で表される主成分を含み、
前記Aはバリウムおよびカルシウムから選ばれる少なくともいずれか1つを含み、
前記Bはチタンおよびジルコニウムから選ばれる少なくともいずれか1つを含み、
前記REは希土類元素を示し、
前記Ca-RE-Si-O偏析相に含まれるカルシウムに対する前記Ca-RE-Si-O偏析相に含まれるケイ素のモル比を(Si/Ca)モル比と表したとき、
前記(Si/Ca)モル比が1より大きく、
前記Ca-RE-Si-O偏析相に含まれる希土類元素に対する前記Ca-RE-Si-O偏析相に含まれるケイ素のモル比を(Si/RE)モル比と表したとき、
前記(Si/RE)モル比が1より大きく、
前記Ca-RE-Si-O偏析相の長軸の平均長さは、前記主相の平均粒径の1.30~2.80倍であり、
前記Ca-RE-Si-O偏析相の短軸の平均長さは、前記主相の平均粒径の0.21~0.48倍である。
前記(RE/Ca)モル比が1より大きいことが好ましい。
本実施形態に係る電子部品の一例としての積層セラミックコンデンサ1が図1Aおよび図1Bに示される。積層セラミックコンデンサ1は、誘電体層2と、内部電極層3と、が交互に積層された構成の素子本体10を有する。この素子本体10の両端部には、素子本体10の内部で交互に配置された内部電極層3と各々導通する一対の外部電極4が形成してある。素子本体10の形状に特に制限はないが、通常、直方体状とされる。また、素子本体10の寸法にも特に制限はなく、用途に応じて適当な寸法とすればよい。
誘電体層2は、後述する本実施形態に係る誘電体組成物から構成されている。
本実施形態では、内部電極層3は、各端部が素子本体10の対向する2端面の表面に交互に露出するように積層してある。
外部電極4に含有される導電材は特に限定されない。たとえばNi、Cu、Sn、Ag、Pd、Pt、Auあるいはこれらの合金、導電性樹脂等公知の導電材を用いればよい。外部電極4の厚さは用途等に応じて適宜決定すればよい。
図2に示すように、本実施形態に係る誘電体層2を構成する誘電体組成物は、主相14の間にCa-RE-Si-O偏析相16を含む。ここで、REは希土類元素を表す。
本実施形態の主相14はABO3で表される主成分を含む。なお、主相14の主成分とは、主相100質量部に対して、80~100質量部を占める成分であり、好ましくは、90~100質量部を占める成分である。
図2に示すように、本実施形態に係る誘電体層2を構成する誘電体組成物は、上記の主相14の間に、Ca-RE-Si-O偏析相16を含む。これにより、本実施形態に係る誘電体組成物は、密度が高く、なおかつ、高い強度を示すことができる。
次に、図1に示す積層セラミックコンデンサ1の製造方法の一例について以下に説明する。
上述した実施形態では、本発明に係る電子部品が積層セラミックコンデンサである場合について説明したが、本発明に係る電子部品は、積層セラミックコンデンサに限定されず、上述した誘電体組成物を有する電子部品であれば何でもよい。
誘電体組成物に含まれる主相の主成分の出発原料として、炭酸バリウム(BaCO3)、炭酸カルシウム(CaCO3)、酸化チタン(TiO2)、酸化ジルコニウム(ZrO2)の粉末を準備した。焼成後の主相の主成分が表1および表3に記載の通りになるように、準備した出発原料を秤量した。
実験2では、偏析相を析出させずに、主相に第1添加剤の成分を有する被覆層を形成した以外は、実験1と同様にして、試料を得て、密度および3点曲げ強さを測定した。
10… 素子本体
2… 誘電体層
14… 主相
16… Ca-RE-Si-O偏析相
3… 内部電極層
4… 外部電極
Claims (7)
- 主相と、Ca-RE-Si-O偏析相と、を含む誘電体組成物であって、
前記主相はABO3で表される主成分を含み、
前記Aはバリウムおよびカルシウムから選ばれる少なくともいずれか1つを含み、
前記Bはチタンおよびジルコニウムから選ばれる少なくともいずれか1つを含み、
前記REは希土類元素を示し、
前記Ca-RE-Si-O偏析相に含まれるカルシウムに対する前記Ca-RE-Si-O偏析相に含まれるケイ素のモル比を(Si/Ca)モル比と表したとき、
前記(Si/Ca)モル比が1より大きく、
前記Ca-RE-Si-O偏析相に含まれる希土類元素に対する前記Ca-RE-Si-O偏析相に含まれるケイ素のモル比を(Si/RE)モル比と表したとき、
前記(Si/RE)モル比が1より大きく、
前記Ca-RE-Si-O偏析相の長軸の平均長さは、前記主相の平均粒径の1.30~2.80倍であり、
前記Ca-RE-Si-O偏析相の短軸の平均長さは、前記主相の平均粒径の0.21~0.48倍である誘電体組成物。 - 前記Ca-RE-Si-O偏析相に含まれるカルシウムに対する前記Ca-RE-Si-O偏析相に含まれる希土類元素のモル比を(RE/Ca)モル比と表したとき、
前記(RE/Ca)モル比が1より大きい請求項1に記載の誘電体組成物。 - 前記REは、イットリウム、ジスプロシウムおよびホルミウムから選ばれる少なくとも1つである請求項1または2のいずれかに記載の誘電体組成物。
- 前記Ca-RE-Si-O偏析相に含まれる酸素以外の元素の合計を1モル部としたとき、前記Ca-RE-Si-O偏析相に含まれるカルシウム、希土類元素およびケイ素の合計が0.9モル部以上である請求項1~3のいずれかに記載の誘電体組成物。
- 前記Ca-RE-Si-O偏析相の結晶系は六方晶である請求項1~4のいずれかに記載の誘電体組成物。
- 請求項1~6のいずれかに記載の誘電体組成物を備える電子部品。
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