Effects of anisotropic in-plane strains on the phase diagram of BaxSr1-xTiO3 thin film
Yong-Mei Tao, Yin-Zhong Wu
TL;DR
This study uses Landau-Devonshire theory to explore how anisotropic in-plane strains influence the phase diagram and pyroelectric properties of BST50/50 thin films, revealing unique phase behavior compared to BaTiO3.
Contribution
It provides the first detailed phase diagram of BST50/50 thin films under anisotropic strains using phenomenological modeling.
Findings
Paraelectric phase appears under anisotropic strains at room temperature.
Pyroelectric peak position is highly dependent on anisotropic misfit strains.
Distinct phase behavior compared to BaTiO3 thin films.
Abstract
Based on Landau-Devonshire (LD) phenomenological theory, phase diagram of epitaxial BST50/50 thin films on anisotropic in-plane strains is investigated. Different from BaTiO3 thin films, the paraelectric phase appears under the anisotropic misfit strains on BST50/50 thin films at the room temperature. The pyroelectric property of the BST films is also calculated, we find that the position of pyroelectric peak greatly depends on anisotropic misfit strains. Keywords: anisotropic in-plane strains; BST thin films; phase diagram
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