JP2016037439A - チタン化合物含有コアシェル紛体及びその製造方法、及びチタン化合物含有焼成体 - Google Patents
チタン化合物含有コアシェル紛体及びその製造方法、及びチタン化合物含有焼成体 Download PDFInfo
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Abstract
Description
チタン化合物紛体と無機塩紛体とを調製するステップ;
前記チタン化合物紛体と前記無機塩紛体とを混合して、予備成形紛体を形成するステップ;及び
前記チタン化合物紛体の各粒子表面上にチタン化合物含有結晶性シェル層を形成するため、前記予備成形紛体を焼成に付して、前記チタン化合物紛体の粒子表面と、前記無機塩紛体との固相反応を引き起こすステップ
を有する。
前記コアシェル粒子の各々は、コア本体と、前記コア本体を封入するシェル層とを包含する、チタン化合物含有焼成体が提供される。前記コア本体は導電性である。前記シェル層は、ペロブスカイト構造を有するチタン酸塩酸化物及びスピネル構造を有するチタン酸塩酸化物からなるグループから選択される結晶を包含する。前記コア本体及び前記シェル層は互いに化学的に結合している。前記コアシェル粒子の隣接するそれぞれの前記シェル層は、焼成プロセスを介して互いに相互結合している。
本発明によるコアシェル紛体の実施形態は、複数のコアシェル粒子を包含する。
チタン化合物紛体と無機塩紛体とを調製するステップ;
前記チタン化合物紛体と前記無機塩紛体とを混合して、予備成形紛体を形成するステップ;及び
前記チタン化合物紛体の各粒子表面上にチタン化合物含有結晶性シェル層を形成するため、前記予備成形紛体を焼成に付して、前記チタン化合物紛体の粒子表面と、前記無機塩紛体との固相反応を引き起こすステップ
を包含する。
前記実施形態のコアシェル紛体を溶媒内で粉砕するステップ;
前記粉砕の後、スラリーを形成するため、コアシェル紛体と有機バインダ(例えばポリ(ビニルアルコール)(PVA)もしくはポリ(ビニルブチラール)(PVB))とを混合するステップ;
グリーンシートを形成するため、スラリーを注型するステップ;
プリントグリーンシートを形成するため、前記グリーンシート上で金属電極層をプリントするステップ;
複数のシートを形成するため、前記プリントグリーンシートを切断するステップ;
予備成形バーを形成するため、前記シートを積み重ねるステップ;
前記予備成形バーを所望のサイズに切断するステップ;
チップを形成するため、前記予備成形バーから有機バインダを除去するステップ;
チタン化合物含有焼成煉瓦を形成するため、1100℃乃至1300℃の温度で前記チップを焼成するステップ;
前記チタン化合物含有焼成煉瓦の2つの対辺上の銅電極を浸漬するステップ;及び
外部電源に電気的に結合される準備ができているMLCCを形成するため、前記銅電極の各々の上のニッケル保護層とスズ層とを電気メッキするステップ
を包含する。
コアシェル粒子の各々のシェル層2は誘電性である。
アルコール内に予備成形紛体を形成するため、炭酸バリウム紛体及びTiN紛体をアルコール内で混合し、直径0.1mmを有する二酸化ジルコニウムボールを備えたボールミル内で粉砕した。炭酸バリウム紛体対TiN紛体のモル比は、1:5であった。
実施例2:
アルコール内に予備成形紛体を形成するため、炭酸ストロンチウム紛体及びTiN紛体をアルコール内で混合し、直径0.1mmを有する二酸化ジルコニウムボールを備えたボールミル内で粉砕した。炭酸ストロンチウム紛体対TiN紛体のモル比は、3:10であった。
実施例3:
アルコール内に予備成形紛体を形成するため、炭酸リチウム紛体及びTiN紛体をアルコール内で混合し、直径0.1mmを有する二酸化ジルコニウムボールを備えたボールミル内で粉砕した。炭酸リチウム紛体対TiN紛体のモル比は、3:10であった。
分析結果:
図2は、実施例1のコアシェル粒子のX線回折パターンである。図2中、正方形の符号でマークされているピークは、TiNのピークを表し、菱形の符号でマークされるピークは、チタン酸バリウムのピークを表す。その結果は、実施例1のコアシェル粒子はもっぱらTiNとチタン酸バリウムとを有し、不純物もしくは副生物を含まないことを示す。
2 シェル層
Claims (17)
- 複数のコアシェル粒子を有するチタン化合物含有コアシェル紛体であって、
前記コアシェル粒子の各々は、コア本体と、前記コア本体を封入するシェル層とを包含し、
前記コア本体は導電性であり、
前記シェル層は、ペロブスカイト構造を有するチタン酸塩酸化物及びスピネル構造を有するチタン酸塩酸化物からなるグループから選択される結晶を包含し、
前記コア本体及び前記シェル層は互いに化学的に結合している、
コアシェル紛体。 - 前記コアシェル粒子の各々の前記コア本体はTiNからなる、請求項1に記載のコアシェル紛体。
- 前記結晶は、チタン酸バリウム及びチタン酸ストロンチウムからなるグループから選択される、請求項2に記載のコアシェル紛体。
- 前記結晶はチタン酸リチウムであり、スピネル構造を有する、請求項2に記載のコアシェル紛体。
- 前記コアシェル粒子の各々の前記シェル層は、前記結晶中にドープされる酸化物をさらに包含する、請求項1乃至4のいずれか一項に記載のコアシェル紛体。
- チタン化合物紛体と無機塩紛体とを調製するステップ;
前記チタン化合物紛体と前記無機塩紛体とを混合して、予備成形紛体を形成するステップ;及び
前記チタン化合物紛体の各粒子表面上にチタン化合物含有結晶性シェル層を形成するため、前記予備成形紛体を焼成に付して、前記チタン化合物紛体の粒子表面と、前記無機塩紛体との固相反応を引き起こすステップ
を有するチタン化合物含有コアシェル紛体を製造する方法。 - 前記チタン化合物紛体はTiNからなる、請求項6に記載のチタン化合物含有コアシェル紛体を製造する方法。
- 焼成は、10ppmより大きく、10000ppm未満の酸素の分圧で行われる、請求項6及び7のいずれか一項に記載のチタン化合物含有コアシェル紛体を製造する方法。
- 無機塩紛体は、バリウムイオン、ストロンチウムイオン、リチウムイオン及びそれらの組み合わせからなるグループから選択されるカチオンを含有する塩である、請求項6及び7のいずれか一項に記載のチタン化合物含有コアシェル紛体を製造する方法。
- 前記塩は、炭酸塩、水酸化物、リン酸塩及びそれらの組み合わせからなるグループから選択されるアニオンをさらに含有する、請求項9に記載のチタン化合物含有コアシェル紛体を製造する方法。
- 前記チタン化合物紛体と前記無機塩紛体とを溶媒内で混合し、次いで予備形成紛体を形成するため乾燥する、請求項6乃至10のいずれか一項に記載のチタン化合物含有コアシェル紛体を製造する方法。
- 複数のコアシェル粒子を有するチタン化合物含有焼成体であって、
前記コアシェル粒子の各々は、コア本体と、前記コア本体を封入するシェル層とを包含し、
前記コア本体は導電性であり、
前記シェル層は、ペロブスカイト構造を有するチタン酸塩酸化物及びスピネル構造を有するチタン酸塩酸化物からなるグループから選択される結晶を包含し、
前記コア本体及び前記シェル層は互いに化学的に結合している、
前記コアシェル粒子の隣接するそれぞれの前記シェル層は、焼成プロセスを介して互いに相互結合している、
チタン化合物含有焼成体。 - 前記コアシェル粒子の各々の前記コア本体はTiNからなる。請求項12に記載のチタン化合物含有焼成体。
- 前記結晶は、チタン酸バリウム及びチタン酸ストロンチウムからなるグループから選択される、請求項13に記載のチタン化合物含有焼成体。
- 前記結晶はチタン酸リチウムであり、スピネル構造を有する、請求項13に記載のチタン化合物含有焼成体。
- 前記コアシェル粒子の各々の前記シェル層は、前記結晶中にドープされる酸化物もしくは焼成助剤をさらに包含する、請求項12乃至15のいずれか一項に記載のチタン化合物含有焼成体。
- 前記コアシェル粒子の各々の前記シェル層は誘電性である、請求項12乃至16のいずれか一項に記載のチタン化合物含有焼成体。
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