Dielectric properties of spark-plasma-sintered solid solution (1 m x )(Na 0.5 K 0.5 )NbO 3 m x PbTiO 3 were studied. Both the cubic-tetragonal and the tetragonal-orthorhombic phase transitions become more and more diffuse with increasing x . The strong deviation of the cubic-tetragonal phase transition temperature versus composition curve from the Vegard's law is observed. It is considered that (1) the introduction of heterovalence ions to both the perovskite A and B sites, and (2) the change of the mass difference between the perovskite B- and A-site, m B - m A, are two main factors responsible for the observations.
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Wang et al. (2003) studied this question.