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arXiv 0801.3594cond-mat.mtrl-scicond-mat.other
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基于第一性原理的(0001)_{α-Al_2 O_3}衬底上(100)_{YSZ }和(111)_{ YSZ }外延岛的界面能

Interface energies of (100)_{YSZ} and (111)_{YSZ} epitaxial islands on (0001)_{alpha-Al_2O_3} substrates from first principles

F. Lallet, N. Olivi-Tran, Laurent J. Lewis

摘要:

用从头算方法研究了立方相氧化钇稳定的氧化锆(YSZ)在(0001)α-Al_2 O_3衬底上的外延层界面能。的接口建模使用超晶胞几何和计算进行的框架内的密度泛函理论(DFT)和局域密度近似(LDA)使用的投影增广波(PAW)赝势方法。计算结果表明,(111)_{YSZ}||(0001)_{α-Al_2 O_3}界面能低于(100)_{YSZ}||(0001)_{α-Al_2O_3}。这一结果对于理解YSZ固体薄膜在(0001)_{α-Al_2 O_3}衬底上的岛化行为具有重要意义。

英文摘要:

We present an ab initio study of the interface energies of cubic yttria-stabilized zirconia (YSZ) epitaxial layers on a (0001)_{alpha-Al_2O_3} substrate. The interfaces are modelled using a supercell geometry and the calculations are carried out in the framework of density-functional theory (DFT) and the local-density approximation (LDA) using the projector-augmented-wave (PAW) pseudopotential approach. Our calculations clearly demonstrate that the (111)_{YSZ} || (0001)_{alpha-Al_2O_3} interface energy is lower than that of (100)_{YSZ} || (0001)_{alpha-Al_2O_3}. This result is central to understanding the behaviour of YSZ thin solid film islanding on (0001)_{alpha-Al_2O_3} substrates, either flat or in presence of defects.

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