热电性
微晶
铁电性
纳米晶材料
压电
材料科学
极化(电化学)
凝聚态物理
光学
光电子学
纳米技术
复合材料
化学
电介质
物理
物理化学
冶金
作者
Yachin Ivry,Vera Lyahovitskaya,Ilya Zon,Igor Lubomirsky,Ellen Wachtel,Alexander L. Roytburd
摘要
Self-supported films of nanocrystalline BaTiO3 exhibit a two orders of magnitude enhancement of the pyroelectric coefficient (≈1μC∕cm2K) with respect to the value measured for a single BaTiO3 crystal. The enhancement strongly depends on film geometry and appears only in buckled films where ferroelectric grains undergo self-organization into polycrystalline macrodomains. The authors posit that the enhancement of the pyroelectric effect is related to 90° polarization switching and is, therefore, similar in nature to an “extrinsic” piezoelectric effect.
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