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首页> 外文会议>Materials for energy conversion and storage >Ferroelectric-to-Ferroelectric Phase Transition Induced Electro-Caloric Energy Conversion in Barium Titanate at Room Temperature
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Ferroelectric-to-Ferroelectric Phase Transition Induced Electro-Caloric Energy Conversion in Barium Titanate at Room Temperature

机译：室温下钛酸钡中铁电-铁电相变诱导的电热能转换

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The electro-caloric (EC) energy conversions in single-crystal and polycrystalline barium titanate samples are investigated using differential scanning calorimetry (DSC). The DSC measurement reveals a refrigeration effect of 0.1 J/g under an electric field of 15 kV/cm at T= 17.5 ℃, which is related with the ferroelectric-to-ferroelectric transition in barium titanate. The thermodynamics calculation based on Maxwell's relations leads to similar conclusion. Such EC effect shows relaxation with the heat release process more significant than the heat adsorption process when the applied field is switched, which is different with those occur near the ferroelectric- to-paraelectric transition temperatures. Furthermore, the electro-caloric energy conversion relation or the scaling relation between the maximum refrigeration effect △H_(max) and the applied field E, is found to follow a power law △H_(max)～E~b with b=1.72, which is significantly larger than those for EC effects related with the ferroelectric-to-paraelectric transitions.
机译：使用差示扫描量热法（DSC）研究了单晶和多晶钛酸钡样品中的电热（EC）能量转换。 DSC测量表明，在T = 17.5的15 kV / cm电场下，制冷效果为0.1 J / g，这与钛酸钡中铁电-铁电转变有关。基于麦克斯韦关系的热力学计算得出相似的结论。当切换施加的电场时，这种EC效应显示出放热过程中的弛豫比吸热过程中的弛豫更为显着，这与在铁电至顺电转变温度附近发生的情况不同。此外，发现电热能转换关系或最大制冷效应△H_（max）与外加电场E之间的比例关系遵循幂定律△H_（max）〜E〜b，且b = 1.72，它远大于与铁电-顺电转变有关的EC效应的电势。

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