Abstract
The paper presents the results of detailed studies of thermal expansion of solid solutions (1-x)Na1/2Bi1/2TiO3-xBaTiO3 with x=0.04-0.97 in the temperature range from 100 to 900 K. A change in chemical pressure associated with the complex cationic substitution, (Na1/2Bi1/2)2+→ Ba2+, result in a very rapid decrease in the temperatures of the transformation P4mm→C2mm→R3m below 100 K which are characteristic of BaTiO3. Significant features in the behavior of thermal expansion were observed near two triple points in the T−x phase diagram where the phases Pm3̄m, P4mm, P4bm (x≈0.15-0.20) and P4bm, P4mm, R3c (x≈0,06) coexist, allow the studied solid solutions to be divided into three groups. The relationship between the effects of internal chemical pressure and external hydrostatic one is discussed. By analyzing the thermodynamic potential, the root-mean-square polarization Pd is determined, which increases by about 16% with a decrease in the BT content from 0.97 to 0.4.
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