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Theoretical investigations of structural, elastic and thermodynamic properties for PtN2 under high pressure

机译:高压下PtN2的结构,弹性和热力学性质的理论研究

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We have investigated structural and elastic properties of PtN2 under high pressures using norm-conserving pseudopotentials within the local density approximation (LDA) in the frame of density-functional theory. Calculated results of PtN2 are in agreement with experimental and available theoretical values. The a/a(0), V/V-0, ductility/brittleness, elastic constants C-ij, shear modulus C, bulk modulus B, shear modulus G, Young's modulus E, Poisson's ratio sigma and anisotropy factor A as a function of applied pressure are presented. Through the quasi-harmonic Debye model, we also study thermodynamic properties of PtN2. The thermal expansion versus temperature and pressure, thermodynamic parameters X (X = Debye temperature or specific heat) with varying pressure P and heat capacity of PtN2 at various pressures and temperatures are estimated. (C) 2008 Elsevier B.V. All rights reserved.
机译:我们在密度泛函理论的框架内,使用局部密度近似(LDA)内的守恒范式伪势研究了高压下PtN2的结构和弹性性能。 PtN2的计算结果与实验和可用的理论值一致。 a / a(0),V / V-0,延展性/脆性,弹性常数C-ij,剪切模量C,体积模量B,剪切模量G,杨氏模量E,泊松比σ和各向异性因子A作为函数显示了施加的压力。通过准谐波德拜模型,我们还研究了PtN2的热力学性质。估算了热膨胀与温度和压力的关系,具有变化的压力P的热力学参数X(X =德拜温度或比热)以及在各种压力和温度下PtN2的热容。 (C)2008 Elsevier B.V.保留所有权利。

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