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US08704429B2 Bismuth iron oxide powder, manufacturing method for the bismuth iron oxide powder, dielectric ceramics, piezoelectric element, liquid discharge head, and ultrasonic motor 有权
氧化铁铋粉，氧化铁铋粉末，电介质陶瓷，压电元件，液体排出头，超声波电机的制造方法

Bismuth iron oxide powder, manufacturing method for the bismuth iron oxide powder, dielectric ceramics, piezoelectric element, liquid discharge head, and ultrasonic motor
摘要：
Provided is a lead-free dielectric ceramics having a low leakage current value, and a bismuth iron oxide powder as a raw material thereof. The bismuth iron oxide powder includes at least: (A) grains including a bismuth iron oxide having a perovskite-type crystal structure; (B) grains including a bismuth iron oxide having a crystal structure classified to a space group Pbam; and (C) grains including a bismuth iron oxide or a bismuth oxide having a crystal structure that is classified to a space group I23. The dielectric ceramics are made of bismuth iron oxide in which the bismuth iron oxide crystals having the crystal structure classified to the space group Pbam are distributed at a grain boundary of crystal grains of the bismuth iron oxide crystals having the perovskite-type crystal structure.
摘要（中）：

提供具有低漏电流值的无铅电介质陶瓷和作为其原料的氧化铋铁粉末。 氧化铋粉末至少包括：（A）包含具有钙钛矿型晶体结构的氧化铋的晶粒; （B）包含具有分类为空间群Pbam的晶体结构的氧化铋的晶粒; 和（C）包含分类为空间群I23的具有晶体结构的氧化铋铁或氧化铋的晶粒。 介电陶瓷由氧化铋铁氧化物制成，其中具有分类为空间群Pbam的晶体结构的氧化铋晶体分布在具有钙钛矿型晶体结构的氧化铋晶体的晶粒的晶界处。

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