Formation of phases during the solid state synthesis of the [(Na 0.5 Bi 0.5 ) 0.80 Bа 0.20 ](Ti 1−у B у )O 3 system of solid solutions, with substitutions of zirconium and tin ions for titanium ones, has been investigated. It is demonstrated that the synthesis is a multi-step process which is accompanied by the formation of a number of intermediate phases (depending on the composition of the solid solution and the temperature of synthesis). Single phase solid solutions have been manufactured when the sintering temperature was increased to 1000 -1100 °C.An increase of the concentration of the substituting ions results in a linear increase in the size of the crystal cell. As a consequence the reduction of the tolerance factor and an increase of the stability of the antiferroelectric phase with respect to the ferroelectric one take place.

This study investigates the phase formation of Zr-substituted [(Na 0.5 Bi 0.5 ) 0.80 Ba 0.20 ](Ti 1 -y Zr y )O 3 system during its solidstate synthesis. The synthesis was found to be a multistep process accompanied by the formation of a number of intermediate phases which depend on the solid solution's composition and sintering temperatures. Single-phase solid solutions were obtained when the sintering temperature was increased to 1000°C-1100°C. Increase in content of substituting Zr-ions tends to linearly increase in the size of the crystal cell leading to reduction in the tolerance factor which results in the increase in stability of the antiferroelectric phase relative to the ferroelectric phase.

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The paper presents results of studies of the formation of phases during the solid-state synthesis in the [(Na 0:5 Bi 0:5 Þ 0:80 Ba 0:20 ðTi 1Ày B y ÞO 3 system of solid solutions with B-site substitutions. The substitutions by zirconium, tin and ion complexes (In 0:5 Nb 0:5 Þ and (Fe 0:5 Nb 0:5 Þ have been studied. It has been found that the synthesis is a multi-step process associated with the formation of a number of intermediate phases (depending on the compositions and calcination temperatures). Single-phase solid solutions have been produced at the calcination temperatures in the interval 1000-1100 C. An increase in the substituting ions concentration leads to a linear increase of the crystal cell size. At the same time, the tolerance factor gets reduced boosting the stability of the antiferroelectric phase as compared to that of the ferroelectric phase.

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