JP4805938B2 - 誘電体磁器およびその製法、並びに積層セラミックコンデンサ - Google Patents
誘電体磁器およびその製法、並びに積層セラミックコンデンサ Download PDFInfo
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- JP4805938B2 JP4805938B2 JP2007533211A JP2007533211A JP4805938B2 JP 4805938 B2 JP4805938 B2 JP 4805938B2 JP 2007533211 A JP2007533211 A JP 2007533211A JP 2007533211 A JP2007533211 A JP 2007533211A JP 4805938 B2 JP4805938 B2 JP 4805938B2
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/80—Phases present in the sintered or melt-cast ceramic products other than the main phase
- C04B2235/85—Intergranular or grain boundary phases
Description
まず本発明の誘電体磁器について詳細に説明する。図1は本発明の誘電体磁器を示す一部を拡大した断面模式図である。本発明に係る誘電体磁器はチタン酸バリウム系の主結晶粒子1を主構成鉱物とするものであり、その構成成分はTiと、Ca、Sr、Baから選ばれる少なくとも1種のアルカリ土類金属元素を主成分とする複合酸化物である。
なお、Ca濃度が0.2原子%以下の第1結晶粒子1aと、Ca濃度が0.4原子%以上の第2結晶粒子1bは、チタン酸バリウム(BaTiO3)粉末とチタン酸バリウム・カルシウム(Ba1-XCaXTiO3 、X=0.01〜0.2)粉末を混合して焼結させることにより得ることができる。
次に、本発明の誘電体磁器の製法について説明する。まず、Tiと、Ca、Sr、Baから選ばれる少なくとも1種のアルカリ土類金属元素を主成分とする複合酸化物粉末を準備する。次いで、この複合酸化物粉末の表面にMg、Mnおよび希土類元素の被覆加工を行い、Mg、Mnおよび希土類元素が被覆された誘電体粉末を調製する。この場合、Mg、Mnおよび希土類元素の複合酸化物粉末への被覆加工は、Mg、Mnおよび希土類元素の水溶液を複合酸化物粉末と加熱混合することにより行われる。
本発明の積層セラミックコンデンサについて、図2の概略断面図をもとに詳細に説明する。図2は、本発明の積層セラミックコンデンサを示す概略断面図である。本発明の積層セラミックコンデンサは、コンデンサ本体11の両端部に外部電極13が形成されている。この外部電極13は、例えば、CuもしくはCuとNiの合金ペーストを焼き付けて形成されている。
次に、本発明に係る積層セラミックコンデンサの製法について詳細に説明する。図3は、本発明の積層セラミックコンデンサの製法を示す工程図である。
チタン酸バリウム粉末(BT粉末)とチタン酸バリウム・カルシウム粉末(BCT粉末)の平均粒径はともに0.25μmものとした。BT粉末とBCT粉末とを混合するに当っては、BT粉末とBCT粉末とを等モル量混合し、Mg、MnおよびYの被覆量はBT粉末とBCT粉末を100質量部として調製した。また、BT粉末およびBCT粉末のA/Bサイト比は1.003のものを用いた。また、BT粉末およびBCT粉末の粒径は主体が0.2〜0.4μmのものを用いた。また、ガラス粉末の組成はSiO2=50、BaO=20、CaO=20、Li2O=10(モル%)とした。
Claims (5)
- 主結晶粒子が、TiとBaとを含み、Ca濃度が0.2原子%以下の複合酸化物である第1結晶粒子、およびTiとBaとを含み、Ca濃度が0.4原子%以上の複合酸化物である第2結晶粒子を有し、前記主結晶粒子は、前記Baおよび前記Caの合計量をAモルとし、前記Tiの量をBモルとしたときのモル比(A/B)が1.003以上であり、前記主結晶粒子がMg、Mnおよび希土類元素の金属成分を含有するとともに、前記Mg、Mnおよび希土類元素の少なくとも1種の金属成分が前記主結晶粒子の内部よりも表面側に高濃度で存在しており、その濃度比(表面側/内部)が1.5倍以上であり、前記第1結晶粒子および前記第2結晶粒子を構成している前記複合酸化物の合計100質量部に対して、Zrを酸化物換算で0.04〜0.2質量部含有し、比誘電率が3580以上であることを特徴とする誘電体磁器。
- 前記主結晶粒子の平均粒径が0.4μm以下であることを特徴とする請求項1に記載の誘電体磁器。
- 請求項1または2に記載の誘電体磁器の製法であって、チタン酸バリウム粉末とチタン酸バリウム・カルシウム粉末との混合粉末の表面にMg、Mnおよび希土類元素を被覆した誘電体粉末100質量部に対して、酸化ジルコニウムを0.04〜0.2質量部添加し、成形した後、焼成することを特徴とする誘電体磁器の製法。
- 前記誘電体粉末の平均粒径が0.3μm以下であることを特徴とする請求項3に記載の誘電体磁器の製法。
- 誘電体層と内部電極層とを交互に積層してなるコンデンサ本体を具備する積層セラミックコンデンサにおいて、前記誘電体層が請求項1または2に記載の誘電体磁器であることを特徴とする積層セラミックコンデンサ。
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