A thermodynamic potential, energy storage performances, and electrocaloric effects of Ba1-xSrxTiO3 single crystals
A thermodynamic potential, energy storage performances, and electrocaloric effects of Ba1-xSrxTiO3 single crystals
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Ba1-xSrxTiO3单晶的热力学势、储能性能和电热效应
DOI：
10.1063/1.5020515
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发表时间：
2018-03-05
影响因子：
4
通讯作者：
Chen, L. Q.
中科院分区：
文献类型：
--
作者：
Huang, Y. H.;Wang, J. J.;Chen, L. Q.
建立了Ba_（1-x）Sr_xTiO_3固溶体的热力学势，计算了Ba_（1-x）Sr_xTiO_3单晶的热力学性质。由热力学势预测的温度-组成相图与实验测量结果吻合较好。在此基础上，采用相场法计算了Ba_（1-x）Sr_xTiO_3单晶的储能性能和电热效应。研究发现，存在一个最佳Sr浓度，使Ba_（1-x）Sr_xTiO_3单晶在外加电场下的放电能量密度最大。预测了Ba_（0.8）Sr_（0.2）TiO_3、Ba_（0.7）Sr_（0.3）TiO_3、Ba_（0.6）Sr_（0.4）TiO_3和Ba_（0.5）Sr_（0.5）TiO_3单晶的电热效应，并确定了相应的最佳温度。
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.