Murata Manufacturing Co., Ltd.

Tomoo Motoki

Harunobu Sano

Masahiro Naito

Norihiko Sakamoto

A non-reducing dielectric ceramic contains Ca, Zr and Ti as metallic elements and does not contain Pb. In a CuK&agr; X-ray diffraction pattern, the ratio of the maximum peak intensity of secondary crystal phases to the maximum peak intensity at 2&thgr;&equals;25&deg; to 35&deg; of a perovskite primary crystal phase is about 12% or less, the secondary crystal phases including all the crystal phases other than the perovskite primary crystal phase. The non-reducing dielectric ceramic exhibits superior insulating resistance and dielectric loss after firing in a neutral or reducing atmosphere and high reliability in a high-temperature loading lifetime test and is useful for producing compact high-capacitance monolithic ceramic capacitors.

Non-reducing dielectric ceramic, monolithic ceramic capacitor using the same, and method for making non-reducing dielectric ceramic

Nonreducing dielectric ceramic and monolithic ceramic capacitor using the same

An anti-reducing dielectric ceramic composition having a dielectric constant of 100 or higher and excellent reliability during a life measuring test under a high temperature load and a monolithic ceramic capacitor formed by using the improved anti-reducing dielectric ceramic composition. The composition is a composite oxide represented by the composition formula (Ca,Sr,),(Zr,Ti,)O,, 0&lE;x<0.5, 0.60<y&lE;0.85 and 0.85<m<1.30 as a main component. Every 100 mols of the main component is mixed with at least one of a manganese compound and a magnesium compound incorporated as an accessory component in a range of about 0.1 to 6 mols, by calculatively converting the manganese compound into MnO and the magnesium compound into MgO. The composition may further contain a sintering auxiliary material such as SiO,.

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Izumo, Japan

Tomoo Motoki