Enhanced tetragonality in (x)PbTiO3-(1-x)Bi(Zn1/2Ti1/2)O3 and related solid solution systems -: art. no. 262905

The solid solutions (x)PbTiO3-(1-x)Bi(Zn1/2Ti1/2)O-3, (x)PbTiO3-(1-x)Bi(Zn1/2Zn1/2)O-3, and (x)PbTiO3-(1-x)Bi(Zn1/2Sn1/2)O-3, have been examined by x-ray diffraction, dielectric measurements, and thermal analysis. Unlike most PbTiO3-based solid solutions, these systems show enhanced tetragonality with substitution for PbTiO3. In particular, the (x)PbTiO3-(1-x)Bi(Zn1/2Ti1/2)O-3 system exhibits a high c/a ratio of 1.11 for x=0.60. Accordingly, the Curie temperature (T-C) also increases, exceeding 700 degrees C at the same composition. It is proposed that PbTiO3-Bi(B)O-3-type solid solutions which contain only highly polarizable cations on the B site are likely to exhibit similar enhancements in tetragonality and T-C.