Dielectric ceramic composition, electronic component, and laminated ceramic capacitor
A technology for ceramic compositions and dielectrics, applied in the fields of electronic components and dielectric ceramic compositions, can solve the problems of insufficient reliability, deviation of characteristics of dielectric ceramic compositions, etc.
Active Publication Date: 2022-05-17
TDK CORPARATION
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Problems solved by technology
However, in this case, variations may occur in the characteristics of the dielectric ceramic composition, and sufficient reliability may not be obtained.
Method used
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[0144] Hereinafter, the present invention will be described based on more detailed examples, but the present invention is not limited to these examples.
[0145] Sample number 1 (solid phase method)
[0146] Barium titanate powder having an average SEM particle size of 20 nm and a Ba / Ti molar ratio of 0.990 was prepared.
[0147] The prepared barium titanate powder and calcium carbonate were dispersed in an aqueous solution to obtain a pre-slurry. The concentration of barium titanate in the pre-slurry was 30% by weight, and calcium carbonate was added so that the molar ratio of Ca / Ti became 0.010.
[0148] The above-mentioned pre-slurry was dispersed by a ball mill for 20 hours to obtain a mixed slurry.
[0149] The above mixed slurry was dried at 100° C. for 10 hours to obtain dry powder.
[0150] The above dry powder was calcined at 900° C. for 5 hours to obtain a base material.
[0151] Compared to the TiO in the base material mentioned above 2 100 mole parts, as a ...
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Abstract
The present invention provides a dielectric ceramic composition having excellent reliability and an electronic component using the dielectric ceramic composition. A dielectric ceramic composition, in the case where A represents an element at the A site, B represents an element at the B site, and O represents an oxygen element, the general formula ABO 3 The shown perovskite compound is a main component, A contains Ba, A further contains at least one selected from Ca and Sr, and B contains Ti, and the lattice volume of the sintered body obtained by X-ray diffraction method is as follows.
Description
technical field [0001] The present invention relates to a dielectric ceramic composition and an electronic component to which the dielectric ceramic composition is applied, especially a laminated ceramic capacitor. Background technique [0002] Multilayer ceramic capacitors are used in many electronic devices due to their high reliability and low cost. Among them, in recent years, high reliability has been demanded for dielectric layers used in multilayer ceramic capacitors for automotive applications. [0003] Conventionally, in a multilayer ceramic capacitor including a dielectric ceramic composition mainly composed of a perovskite compound as a dielectric layer, oxygen vacancies tend to form in crystal grains of the dielectric ceramic composition. Furthermore, when an electric field is applied to such a dielectric ceramic composition, oxygen vacancies slowly migrate to the cathode side, causing a decrease in reliability. [0004] In this regard, for example, Patent Docu...
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IPC IPC(8): C04B35/468C04B35/47C04B35/465H01G4/12H01G4/30C04B35/49
CPCC04B35/47C04B35/468C04B35/465H01G4/30H01G4/1227C04B35/49C04B2235/3244C04B2235/3225C04B2235/3418C04B2235/3262C04B2235/3239C01G23/006C04B35/462C04B35/4682C04B35/638C04B35/64H01G4/1218C01P2002/34C01P2002/52C01P2002/54C01P2002/70C01P2002/72C01P2004/64C04B2235/3205C04B2235/3206C04B2235/3208C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/3229C04B2235/3236C04B2235/3241C04B2235/3248C04B2235/327C04B2235/3275C04B2235/3279C04B2235/5445C04B2235/5454C04B2235/6562C04B2235/6565C04B2235/6567C04B2235/662C04B2235/76C04B2235/761C04B2235/79H01G4/1245H01B3/12H01G4/0085H01G4/232
Inventor 高野弘介佐佐木桃世兼子俊彦
Owner TDK CORPARATION