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

Claim 2:
3. A piezoelectric ceramic having a composition of:
a[PbTiO3]-b[SrTiO3]-c[BiFeO3]-d[(KxBi1-x)TiO3],
wherein:
0.4≤×≤0.6, 0.1≤a≤0.4, 0.01≤b≤0.2, c≥0.05, d 0.01, and a+b+c+d=1
the piezoelectric ceramic comprises:
a first portion poled in a first direction;
a second portion poled in a second direction opposite to the first direction:
at least one of an A- metal site dopant or a B- metal site dopant in an amount up to 2 at. % per respective metal site;
a Berlincourt d33 value ≤ 250 pm/V;
a Curie temperature, Tc, of ≥ 300° C.; and
a fracture toughness, K1c (×106), of ≥3 MPa×m1/2.