文章基本信息

标题：Large anisotropy of ferroelectric and pyroelectric properties in heteroepitaxial oxide layers
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作者：R. Moalla ; S. Cueff ; J. Penuelas 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2018
卷号：8
期号：1
页码：4332
DOI：10.1038/s41598-018-22349-y
语种：English
出版社：Springer Nature
摘要：). The pyroelectric anisotropy is explicated in term of degree of structural freedom with temperature. In particular, the low in-plane pyroelectric coefficient is explained by a two-dimensional clamping of the layers on the substrate which induces tensile stress (from thermal expansion), competing with the decreasing tetragonality of a-domains (shortening of the polar c-axis lattice parameter). Temperature-dependent XRD measurements have revealed an increased fraction of a-domains with temperature, attesting the occurrence of a partial two-dimensional clamping. These observed properties are of critical importance for integrated pyroelectric devices.