Ceramic electronic device and manufacturing method of the same
AssigneeTaiyo Yuden Co., Ltd.
InventorsMinoru Ryu, Yoshiki Iwazaki
Life of this patent
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Abstract
A ceramic electronic device includes a multilayer structure in which each of a plurality of dielectric layers and each of a plurality of internal electrode layers are alternately stacked, a main component of the plurality of dielectric layers being a ceramic having a perovskite structure expressed by a general formula ABO3. At least one of crystal grains of the plurality of dielectric layers has a core-shell structure. A dispersion of atomic displacement amounts between B site atoms and oxygen atoms of a shell of the core-shell structure is larger than a dispersion of atomic displacement amounts between B site atoms and oxygen atoms of a core of the core-shell structure.
Claims33
A ceramic electronic device comprising:
- a multilayer structure in which each of a plurality of dielectric layers and each of a plurality of internal electrode layers are alternately stacked, a main component of the plurality of dielectric layers being a ceramic having a perovskite structure expressed by a general formula ABO3,
- wherein at least one of crystal grains of the plurality of dielectric layers has a core-shell structure,
- wherein a dispersion of atomic displacement amounts between B site atoms and oxygen atoms of a shell of the core-shell structure is larger than a dispersion of atomic displacement amounts between B site atoms and oxygen atoms of a core of the core-shell structure.
A ceramic electronic device comprising:
- a multilayer structure in which each of a plurality of dielectric layers and each of a plurality of internal electrode layers are alternately stacked, a main component of the plurality of dielectric layers being a ceramic having a perovskite structure expressed by a general formula ABO3,
- wherein at least one of crystal grains of the plurality of dielectric layers has a core-shell structure,
- wherein a direction of atomic displacement between B site atoms and oxygen atoms of a shell of the core-shell structure is different from a direction of atomic displacement between B site atoms and oxygen atoms of a core of the core-shell structure.
A manufacturing method of a ceramic electronic device comprising:
- forming a ceramic multilayer structure by stacking a plurality of stack units, each of which has a structure in which an internal electrode pattern is formed on a dielectric green sheet including ceramic raw material powder having a perovskite structure expressed by a general formula ABO3, the ceramic raw material powder being subjected to a ball milling in acetic acid aqueous solution;
- and
- firing the ceramic multilayer structure,
- wherein a dispersion of atomic displacement amounts between B site atoms and oxygen atoms of a shell of a crystal grain having a core-shell structure included in a dielectric layer obtained from the dielectric green sheet is larger than a dispersion of atomic displacement amounts between B site atoms and oxygen atoms of a core of the core-shell structure.
A manufacturing method of a ceramic electronic device comprising:
- forming a ceramic multilayer structure by stacking a plurality of stack units, each of which has a structure in which an internal electrode pattern is formed on a dielectric green sheet including ceramic raw material powder having a perovskite structure expressed by a general formula ABO3, the ceramic raw material powder being subjected to a ball milling in acetic acid aqueous solution;
- forming a fired structure by firing the ceramic multilayer structure;
- and
- pressing the fired structure and performing a thermal treatment of the fired structure so that a direction of atomic displacement between B site atoms and oxygen atoms of a shell of a crystal grain having a core-shell structure included in a dielectric layer obtained from the dielectric green sheet is different from a direction of atomic displacement between B site atoms and oxygen atoms of a core of the core-shell structure.
Dependencies are inferred from the claim text.