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Mixtures xSrCO 3  (1 - x)BaCO 3  TiO 2  (0 &lt; x &lt; 1) have been mechanically activated by high energy milling in order to promote the formation of mixed (Sr,Ba) carbonate that decomposes, in a single stage, at temperatures generally lower than for the corresponding physical mixtures. By annealing such milled mixtures at high temperatures (≈ 1000 °C), cubic solid solutions Sr x Ba (1-x) TiO 3  are obtained (except at x = 0.1 where a tetragonal solid solution forms) whose lattice parameters decrease linearly with x. The enthalpy of solid solution formation changes with composition showing higher values in the x range between x = 0.2 and 0.5 where the reaction has been demonstrated to occur via the formation of Ba 2 TiO 4 . By contrast, the enthalpy values decrease for x &gt; 0.5.

Synthesis of Sr x Ba (1-x) TiO 3 Solid Solutions from the Mechanically Activated System BaCO 3 - SrCO 3 - TiO 2