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The influence of the B-site ion substitutions in(1-x)(Bi1/2Na1/2)TiO3-xBaTiO3 system of solid solutions on the relativestability of the ferroelectric and antiferroelectric phases has been studied.The ions of zirconium, tin, along with (In0.5Nb0.5), (Fe0.5Nb0.5), (Al0.5V0.5)ion complexes have been used as substituting elements. An increase in theconcentration of the substituting ion results in a near linear variation in thesize of the crystal lattice cell. Along with the cell size variation a changein the relative stability of the ferroelectric and antiferroelectric phasestakes place according to the changes of the tolerance factor of the solidsolution. An increase in the tolerance factor leads to the increase in thetemperature of the ferroelectric-antiferroelectric phase transition, and viceversa. All obtained results demonstrate the predominant influence of the ionsize factor on the relative stability of the ferroelectric andantiferroelectric states in the (Na0.5Bi0.5)TiO3-based solid solutions andindicate the way for raising the temperature of theferroelectric-antiferroelectric phase transition.

Relative stability of a ferroelectric state in (Na0.5Bi0.5)TiO3-based  compounds under substitutions: Role of a tolerance factor in expansion of the  temperature interval of stable ferroelectric state