Enhanced tetragonality in (x)PbTiO3-(1-x)Bi(Zn1/2Ti1/2)O3 and related solid solution systems

Suchomel, Matthew R.; Davies, Peter K.
June 2005
Applied Physics Letters;6/27/2005, Vol. 86 Issue 26, p262905
Academic Journal
The solid solutions (x)PbTiO3-(1-x)Bi(Zn1/2Ti1/2)O3, (x)PbTiO3-(1-x)Bi(Zn1/2Zn1/2)O3, and (x)PbTiO3-(1-x)Bi(Zn1/2Sn1/2)O3, 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)O3 system exhibits a high c/a ratio of 1.11 for x=0.60. Accordingly, the Curie temperature (TC) also increases, exceeding 700 °C at the same composition. It is proposed that PbTiO3-Bi(B)O3-type solid solutions which contain only highly polarizable cations on the B site are likely to exhibit similar enhancements in tetragonality and TC.


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