Ferroelectric phase transition in LiNbO3: Insights from molecular dynamics

Ferroelectric phase transition in LiNbO3: Insights from molecular dynamics
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LiNbO3 中的铁电相变:分子动力学的见解

DOI:
10.1109/tuffc.2012.2408
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发表时间:
2012
期刊:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
影响因子:
--
通讯作者:
W. Schmidt
W. Schmidt
中科院分区:
--
文献类型:
--
作者:
S. Sanna;W. Schmidt

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首次采用密度泛函理论中的从头算分子动力学方法模拟了铌酸锂的铁电-顺电相变。我们的计算表明,结构相变不是一个突然的事件,而是一个连续的过程发生在约100 K的范围内,并涉及不同的离子物种在不同的温度。由于Li和Nb亚晶格的行为不同,铁电转变既表现出位移型转变,又表现出有序-无序型转变。
Ab initio molecular dynamics within density functional theory is used for the first time to model the ferroelectric-paraelectric phase transition in LiNbO3. Our calculations show that the structural phase transition is not an abrupt event, but rather a continuous process occurring over a range of about 100K and involving different ionic species at different temperatures. Because of the different behavior of the Li and Nb sublattices, the ferroelectric transition displays both displacive and order-disorder character.
DOI: 10.1063/1.447334
发表时间: 1984-01-01
影响因子: 4.4
作者:
NOSE, S
通讯作者: NOSE, S