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Origin of pyroelectricity in LiNbO_3

机译:LiNbO_3中热电的起源

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We use molecular dynamics with a first-principles-based shell model potential to study pyroelectricity in lithium niobate. We find that the primary pyroelectric effect is dominant, and pyroelectricity can be understood simply from the anharmonic change in crystal structure with temperature and the Born effective charges on the ions. This opens an experimental route to study pyroelectricity, as candidate pyroelectric materials can be studied with x-ray diffraction as a function of temperature in conjunction with theoretical effective charges. We also predict an appreciable pressure effect on pyroelectricity, so that chemical pressure, i.e., doping, could enhance the pyroelectric and electrocaloric effects.
机译:我们使用分子动力学与基于第一原理的壳模型势来研究铌酸锂中的热电。我们发现主要的热电效应是主要的,热电可以简单地从晶体结构随温度的非谐变化以及离子上的Born有效电荷来理解。这为研究热电性开辟了一条实验途径,因为候选热电材料可以通过X射线衍射与温度以及理论有效电荷的函数进行研究。我们还预测了对热电的显着压力效应,因此化学压力即掺杂可以增强热电和电热效应。

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