US 12,302,759 B2
Method for obtaining lead-free piezoelectric materials and corresponding lead-free piezoelectric materials
Xiaobing Ren, Shaanxi (CN); Shuai Ren, Shaanxi (CN); Yanshuang Hao, Shaanxi (CN); and Minxia Fang, Shaanxi (CN)
Assigned to Xi'an Jiaotong University, Xi'an (CN); and National Institute for Materials Science, Tsukuba (JP)
Filed by Xi'an Jiaotong University, Shaanxi (CN); and National Institute for Materials Science, Tsukuba (JP)
Filed on Oct. 21, 2020, as Appl. No. 17/076,521.
Application 17/076,521 is a continuation of application No. PCT/CN2019/083695, filed on Apr. 22, 2019.
Claims priority of application No. 201810364324.1 (CN), filed on Apr. 23, 2018.
Prior Publication US 2022/0037584 A1, Feb. 3, 2022
Int. Cl. H10N 30/85 (2023.01); C04B 35/495 (2006.01); C04B 35/64 (2006.01); H01L 21/02 (2006.01); H10N 30/097 (2023.01); H10N 30/20 (2023.01); H10N 30/30 (2023.01); H10N 30/853 (2023.01)
CPC H10N 30/8542 (2023.02) [C04B 35/495 (2013.01); C04B 35/64 (2013.01); H10N 30/097 (2023.02); H10N 30/20 (2023.02); H10N 30/302 (2023.02); C04B 2235/3248 (2013.01); C04B 2235/3255 (2013.01)] 14 Claims
 
1. A lead-free piezoelectric material, wherein a general formula for a composition of the lead-free piezoelectric material is represented by:
(1-m-n)[(K0.5-yNa0.5+y)0.96Li0.04Nb1-xSbxO3]-m[(Bi0.5(NazK1-z)0.5ZrO3]-nAZrO3, wherein A is selected from one or a combination of the following divalent metal ions: Ca, Mg and Ba; wherein m, n, x, y and A is further defined to meet at least one of the following conditions:
(1) x=0, y=0.02, z=0, m=0.01, and n=0;
(2) x=0.02, y=0.02, z=0, m=0.01, and n=0;
(3) x=0.03, y=0.02, z=0, m=0.01, and n=0;
(4) x=0.04, y=0.02, z=0, m=0.01, and n=0;
(5) x=0.05, y=0.02, z=0, m=0.01, and n=0;
(6) x=0.06, y=0.02, z=0, m=0.01, and n=0;
(7) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.02;
(8) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.03;
(9) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.04;
(10) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.045;
(11) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.05;
(12) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.055;
(13) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.06;
(14) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.065;
(15) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.07;
(16) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.08; and
(17) A=Ca, x=0.06, y=0.02, z=0, m=0.01, and n=0.1.