Taiyo Yuden Co., Ltd.

Koichi Tsukagoshi

Kotaro Mizuno

Hidetoshi Masuda

Keiichi Hatano

Form internal electrodes with a metal whose silver content is 80 percent by mass or higher, and also constitute piezoelectric ceramic layers with a piezoelectric ceramic whose primary component is an alkaline niobate having a perovskite structure and which contains at least one type of alkaline earth metal selected from calcium and barium, as well as silver, wherein the total content of the alkaline earth metal is 0.2 percent by mol or higher but lower than 2.0 percent by mol when the element content in the B sites of the alkaline niobate represents 100 percent by mol, and wherein the piezoelectric ceramic layers each contain at least one sintered grainthat has silver-segregated regionsinside and the silver-segregated regionshave a long diameter of 10 nm or smaller.

Piezoelectric element and method for manufacturing same

A ceramic electronic device includes a multilayer chip in which a dielectric layer and an internal electrode layer are alternately stacked. Concentration peaks of two or more types of metals different from a main component metal of the internal electrode layer exist at different positions in a stacking direction of the dielectric layer and the internal electrode layer, between the dielectric layer and the internal electrode layer.

Growing community of inventors

Takasaki, Japan

Koichi Tsukagoshi