A thermodynamic potential for Ba1-xSrxTiO3 solid solutions is developed, and the corresponding thermodynamic properties of Ba1-xSrxTiO3 single crystals are calculated. The predicted temperature-composition phase diagram from the thermodynamic potential agrees well with the experimental measurements. Based on this potential, the energy storage performances and electrocaloric effects of Ba1-xSrxTiO3 single crystals are obtained using the phase-field method. It is found that there is an optimal Sr concentration which maximizes the discharged energy density of a Ba1-xSrxTiO3 single crystal under an applied electric field. The electrocaloric effects of Ba0.8Sr0.2TiO3, Ba0.7Sr0.3TiO3, Ba0.6Sr0.4TiO3, and Ba0.5Sr0.5TiO3 single crystals are also predicted, from which the corresponding optimal temperatures are identified.

中文翻译：

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Ba1-xSrxTiO3单晶的热力学势、储能性能和电热效应

开发了 Ba1-xSrxTiO3 固溶体的热力学势，并计算了 Ba1-xSrxTiO3 单晶的相应热力学性质。从热力学势预测的温度组成相图与实验测量结果非常吻合。基于该电位，利用相场法获得了 Ba1-xSrxTiO3 单晶的储能性能和电热效应。结果表明，在外加电场作用下，存在使 Ba1-xSrxTiO3 单晶放电能量密度最大化的最佳 Sr 浓度。还预测了 Ba0.8Sr0.2TiO3、Ba0.7Sr0.3TiO3、Ba0.6Sr0.4TiO3 和 Ba0.5Sr0.5TiO3 单晶的电热效应，从中确定了相应的最佳温度。