Patent ID: 11873253
Assignee: XAAR TECHNOLOGY LIMITED
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  B  H | IPC B  C

Claim 17:
18. A piezoelectric ceramic having a composition of:
a[PbTiO3]-b[SrTiO3]-c[BiFeO3]-d[(KxBi1-x)TiO3],
wherein:
0.4≤×0.6, 0.2≤a≤0.3; 0.025≤b≤0.125; 0.4≤c≤0.6; 0.05≤d≤0.25, and a+b+c+d=1;
b is selected so the piezoelectric material has a Berlincourt d33 value greater than 250 pm/V;
c is selected so the piezoelectric material has a Curie temperature greater than 300° C.; and
the piezoelectric ceramic comprises a first portion poled in a first direction and a second portion poled in a second direction opposite to the first direction.