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Electronic band structure, stability, structural, and elastic properties of IrTi alloys

机译:IrTi合金的电子能带结构,稳定性,结构和弹性

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摘要

The structural properties and mechanical stabilities of B2-IrTi have been investigated using first-principle calculations. The elastic constants calculations indicate that the B2-IrTi is unstable to external strain and the softening of C _(11)-C _(12) triggers the B2-IrTi (cubic) to L1 _0-IrTi (tetragonal) phase transformation. Detailed electronic structure analysis revealed a Jahn-Teller-type band split that could be responsible for elastic softening and structure phase transition. The cubic-tetragonal transition is accompanied by a reduction in the density of states (DOS) at the Fermi level and the d-DOS of Ti at Fermi level plays a decisive role in destabilizing the B2-IrTi phase.
机译:使用第一性原理研究了B2-IrTi的结构性质和机械稳定性。弹性常数计算表明,B2-IrTi对外部应变不稳定,C_(11)-C_(12)的软化触发了B2-IrTi(立方)向L1_0-IrTi(四方)的相变。详细的电子结构分析显示,Jahn-Teller型带分裂可能是造成弹性软化和结构相变的原因。立方四方相变伴随着费米能级的态密度(DOS)的降低,而费米能级的Ti的d-DOS在稳定B2-IrTi相中起着决定性的作用。

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