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arXiv 1905.01437cond-mat.mtrl-sci
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合成AVO3(A = Ba,Sr,Ca,Pb)类钙钛矿的物理性质的比较理论研究

A comparative theoretical study on physical properties of synthesized AVO3 (A = Ba, Sr, Ca, Pb) perovskites

Khandaker Monower Hossain, Mirza H. K. Rubel, M. M. Rahaman, M. M. Hossain, Md Imran Hossain, Anjuman Ara Khatun, J. Hossain, A. K. M. A. Islam

摘要:

本文采用基于密度泛函理论(DFT)的CASTEP方法研究了BaVO3、SrVO3、CaVO3和PbVO3的各种物理性质。计算了弹性常数、体积模量、剪切模量、杨氏模量、Pugh比、泊松比、维氏硬度、普适各向异性指数和Peierls应力,以合理化上述化合物的力学行为。电子能带结构和态密度(DOS)的研究揭示了所有钙钛矿的金属行为的有力证据。成键性质的分析表明存在共价键、离子键和金属键。本文还对AVO_3的光学性质进行了研究和讨论。声子性质的分析表明BaVO3具有动力学稳定性,而SrVO3、CaVO3和PbVO3不具有动力学稳定性。德拜温度和最小热导率的值意味着只有PbVO3化合物具有用作TBC材料的潜力。

英文摘要:

In this paper, we employ CASTEP based on DFT (density functional theory) calculations to investigate various physical properties of BaVO3, SrVO3, CaVO3 and PbVO3. The elastic constants, bulk modulus, Shear modulus, Young's modulus, Pugh's ratio, Poisson's ratio, Vickers hardness, universal anisotropy index and Peierls stress are calculated to rationalize the mechanical behavior of the aforementioned compounds. The study of electronic band structure and density of states (DOS) reveal the strong evidence of metallic behavior for all the perovskites. The analysis of bonding properties exhibits the existence of covalent, ionic and metallic bonds. The optical properties of AVO3 have been carried out and are discussed in this paper as well. The analysis of phonon property implies the dynamical stability of BaVO3 but not for SrVO3, CaVO3 and PbVO3. The values of Debye temperature and minimum thermal conductivity imply that only PbVO3 compound has potential to be used as TBC material.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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