arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1206.2160cond-mat.mtrl-sci
收藏

U2Ti的弹性、热力学、电子和光学性质

Elastic, thermodynamic, electronic and optical properties of U2Ti

M. Z. Hasan, M. M. Hossain, M. S. Islam, F. Parvin, A. K. M. A. Islam

摘要:

采用赝势密度泛函理论对聚变堆用重金属基氚贮存材料U2 Ti进行了研究。首次计算的弹性常数和其它模量的分析表明,弹性和脆性行为具有较大的各向异性。采用考虑振动对系统总自由能贡献的准简谐Debye模型,研究了U_2Ti的有限温度和有限压力下的热力学性质.电子能带结构揭示了金属的导电性,U-5 f态的贡献最大.通过分析光谱,各种结构的起源也解释了计算的电子结构。此外,反射率光谱表明,该材料在8-12.5 eV的能量范围内是完美的反射器。保留字:铀钛合金第一性原理计算准谐波德拜模型;力学性能,能带结构,光学性能

英文摘要:

An investigation of U2Ti, a potentially safe and heavy metal-based storage material for radioactive tritium for fusion reactor, has been performed using pseudopotential density functional theory. The analysis of the elastic constants and other moduli calculated for the first time shows large anisotropy on elasticity and brittle behavior. A quasi-harmonic Debye model, which considers the vibrational contribution to the total free energy of the system, has been used to investigate the finite-temperature and finite-pressure thermodynamic properties of U2Ti. The electronic band structure reveals metallic conductivity and the major contribution comes from U-5f states. By analyzing the optical spectra, the origin of the various structures is also explained in terms of the calculated electronic structure. Further the reflectivity spectrum shows that the material is perfect reflector within the energy range 8-12.5 eV. Keywords: Uranium-titanium alloy; First-principles calculations; Quasi-harmonic Debye model; Mechanical properties, Band structure, Optical properties

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。

↑