Piezoelectric ceramic composition and piezoelectric device
There are provided a piezoelectric ceramic composition that includes a bismuth layer-structured compound, which contains Na, Bi, Co and Ln (lanthanoide), as a main component and a piezoelectric ceramic composition that includes a compound, which contains Na, Bi, Ti, Co and Ln (lanthanoide) and has a Na 0.5 Bi 4.5 Ti 4 O 15 type crystal structure, as a main component, wherein the piezoelectric ceramic composition has an atomic ratio of 0<Ln/(Na+Bi+Ln)≦0.04.
1. A piezoelectric ceramic composition comprising a bismuth layer-structured compound, which contains Na, Bi, Co and Ln (lanthanoide), as a main component, wherein the piezoelectric ceramic composition has an atomic ratio of 0<Ln/(Na+Bi+Ln)≦0.04 and is substantially free of an element of group 2 of the periodic table; and
wherein the bismuth layer-structured compound has no crystal orientation.
2. A piezoelectric ceramic composition according to claim 1 , wherein said Ln is at least one of La, Ce, Pr, Nd and Yb.
3. A piezoelectric device, comprising:
a piezoelectric ceramic composition according to claim 1 ; and
a plurality of electrodes of different polarities arranged on the piezoelectric ceramic composition.
4. A piezoelectric device, comprising:
a piezoelectric ceramic composition according to claim 2 ; and
a plurality of electrodes of different polarities arranged on the piezoelectric ceramic composition.