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I personally prefer rochelle salt to be a biocompatible piezoelectric material, but it may dissolve into aqueous environment of body. Besides, it has not much mechanical strength. Whitlockite { Ca9(Mg,Fe++)(PO4)6(PO3OH) } is both piezo and pyroelectric
Look for alloys, specially of Mg, Ca, Zn, Fe that has a complex intermetallic structure lacking inversion center. similar alloys have been used for human bone structural reinforcement and transplantation as well. (intermetallics are ceramic-like you know)