Abstract

The effect of the type of B-site substituent on the development of the ferroelectric state in the tetragonal part of the composition-temperature (x-T) diagram of (1-x)PbTiO3-xBiB0.5′B0.5″O3 solid solutions is analyzed by applying the second harmonic generation (SHG) method and Raman spectroscopy to three compounds with B0.5′B0.5″ = Mg0.5Ti0.5, Ni0.5Ti0.5, and Ni0.5Zr0.5, having nearly the same tolerance factor and unit-cell tetragonality, at temperatures up to ∼1000 K. The results reveal the importance of B-site divalent dopants with an isotropic electron configuration for the enhancement of local symmetry breaking at the A site and a consequent increase in the Curie temperature at small x, regardless of the macroscopic tetragonality with respect to PbTiO3.

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