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1. (WO2018180770) PIEZOELECTRIC COMPOSITION AND PIEZOELECTRIC ELEMENT

Pub. No.:    WO/2018/180770    International Application No.:    PCT/JP2018/011037
Publication Date: Fri Oct 05 01:59:59 CEST 2018 International Filing Date: Wed Mar 21 00:59:59 CET 2018
IPC: C04B 35/495
H01L 41/083
H01L 41/187
H01L 41/43
Applicants: TDK CORPORATION
TDK株式会社
Inventors: HIROSE, Masakazu
廣瀬 正和
HIROSE, Yuiko
廣瀬 維子
KATOH, Hiroki
加藤 浩輝
Title: PIEZOELECTRIC COMPOSITION AND PIEZOELECTRIC ELEMENT
Abstract:
[Problem] To provide: a piezoelectric composition able to achieve a balance between mechanical strength and electromechanical coupling coefficient k31; and a piezoelectric element comprising the piezoelectric composition. [Solution] A piezoelectric composition which contains manganese and a composite oxide having a perovskite structure represented by general formula ABO3, wherein the piezoelectric composition is characterized in that: the A site element in the ABO3 is potassium or potassium and sodium; the B site element is niobium; and in the piezoelectric composition, a variation exists in the concentration distribution of manganese, and this variation is 35-440% in terms of CV value.