Lead perovskite relaxor-based low-loss ceramic dielectric for high-voltage ceramic capacitors

被引：0

作者：

Furukawa, Osamu ^{[1
]}

Yamashita, Yohachi ^{[1
]}

Harata, Mitsuo ^{[1
]}

机构：

[1] Toshiba Corp, Kawasaki, Japan

来源：

| 1600年 / 30期

关键词：

Ceramic Materials - Dielectric Properties - Dielectric Materials;

D O I：

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学科分类号：

摘要：

A low-loss ceramic dielectric with a less than 0.1% dissipation factor at 100 kHz, based on a modified lead zinc niobate relaxor, has been fabricated by shifting the ferroelectric transition temperature (Tc) to below -55°C. This dielectric has a high dielectric constant (K), ranging from 250 to 2000. The temperature coefficient of capacitance (TCC) locates at the middle area between values for temperature compensation dielectric and values for high-K dielectric. Even at 150°C, high insulation resistance, more than 5 × 1013 Ωcm, was also retained. Moreover, a typical composition with K = 530 revealed that the dielectric has a high breakdown voltage of 95 kV per 10 mm of thickness and a TCC value of -2900 ppm/°C. Accordingly, this dielectric has proven useful for high-voltage ceramic capacitors.

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