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Electronic structures and ferroelectric properties of ABi(2)Ta(2)O(9) (A= Ca, Sr, and Ba)

机译:ABi(2)Ta(2)O(9)(A = Ca,Sr和Ba)的电子结构和铁电性能

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The electronic structures of ABi(2)Ta(2)O(9) (A=Ca, Sr, and Ba) were calculated by using first-principles under optimized structure. As the size of A-site cation decreases from that of Ba2+ to Ca2+ the band-gap between O 2p and Ta 5d increases from 2.0 to 2.9 eV, which responses to the stronger orbital hybridizations between Ta 5d and 0 2p orbits favoring improvement of the ferroelectric property, decrease in leakage current, and increase in both spontaneous polarization and Curie temperature by the structural distortion. In contrast to CaBi2Ta2O9 and SrBi2Ta2O9, the hybridization between Ba 5p orbits and 0 2p orbits in BaBi2Ta2O9 has better structural stability. (c) 2004 Elsevier Ltd. All rights reserved.
机译:通过在优化结构下使用第一原理计算ABi(2)Ta(2)O(9)的电子结构(A = Ca,Sr和Ba)。随着A位阳离子的大小从Ba2 +减小到Ca2 +,O 2p和Ta 5d之间的带隙从2.0增加到2.9 eV,这响应了Ta 5d和0 2p轨道之间较强的轨道杂化,有利于改善铁电特性,漏电流的减小以及由于结构变形而引起的自发极化和居里温度的升高。与CaBi2Ta2O9和SrBi2Ta2O9相比,BaBi2Ta2O9中Ba 5p轨道和0 2p轨道之间的杂交具有更好的结构稳定性。 (c)2004 Elsevier Ltd.保留所有权利。

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