Effects of Additives on Piezoelectric and Related Properties of PbTiO_3 Ceramics

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Effects of addrtrves Li_2CO_3, Ag_2O, NiO, Cr_2O_3, Fe_2O_3, Gd_2O_3, Bi_2O_3, TiO_2, MnO_3, Nb_3O_5 and WO_3 on piezoelectric and related properties of PbTiO_3 ceramics are studied. Additives partly dissolve in lattice and the rest segregate at grain boundary. These additives act as grain growth inhibitors and binders. Additions of LizCO3, Nip, Fe3O.? and M1102 are most effective for densification. The additives GdzO3, Bi,z03, Nb305 and W03 give high resistivity probably by compensating Pb vacancies. Many piezoelectric and related properties depend on species and content of additives. Grain size is a main factor influencing these properties. The specimens with Crz03 and M11O_2 characterized by coarse grain have small s', small dissipation factor, slaort poling time, large coupling factors, high mechanical Q and small elastic compliance. These features may be explained by diminishing of stress between grains, decrease of interfacial polarization and large binding force at grain boundary.
社団法人応用物理学会の論文
1972-04-05