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Computational study of the structural phases of ZnO

机译:ZnO结构相的计算研究

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We use first-principles calculations based on density functional theory to study the structural properties and pressure-induced solid-solid phase transitions of ZnO. Both the local-density and the generalized gradient approximations are employed together with the projector augmented wave potentials to mimic the electron-ion interaction. We consider the wurtzite (B4), rocksalt (B1), zinc blende (B3), CsCl (B2), NaTl (B32), WC (B_h), BN (B_k), NiAs (B8_1), and AsTi (B_i) modifications of ZnO. The calculated structural properties in the B4, B3, B1, and B2 phases are in excellent agreement with earlier ab initio predictions, as is the transition pressure between them. We find that the B4 phase is the most preferred low-pressure candidate in ZnO while the B2 phase is favorable at high pressures. Apart from the previously reported B4 → B1 → B2 phase transition, our study reveals other possible paths for a transition from the B4 to the B2 phase.
机译:我们使用基于密度泛函理论的第一性原理计算来研究ZnO的结构性质和压力诱导的固-固相变。局部密度近似和广义梯度近似都与投影仪的增强波势一起使用,以模仿电子-离子相互作用。我们考虑了纤锌矿(B4),岩盐(B1),锌混合物(B3),CsCl(B2),NaTl(B32),WC(B_h),BN(B_k),NiAs(B8_1)和AsTi(B_i)的修饰的ZnO。在B4,B3,B1和B2相中计算出的结构特性与早期的从头算预测非常一致,它们之间的转变压力也是如此。我们发现B4相是ZnO中最优选的低压候选物,而B2相在高压下是有利的。除了先前报道的B4→B1→B2相变之外,我们的研究还揭示了从B4到B2相转变的其他可能途径。

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