First-Principles Study of Structural Stabilities, Electronic and Optical Properties of SrF2 under High Pressure

First-Principles Study of Structural Stabilities, Electronic and Optical Properties of SrF2 under High Pressure
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高压下SrF2结构稳定性、电子和光学性能的第一性原理研究

DOI:
10.1088/0256-307x/26/7/077103
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发表时间:
2009-07
影响因子:
3.5
通讯作者:
Liu Ri-Ping
Liu Ri-Ping
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li Jie;Zhang Su-Hong;Yang Xiao-Cui;Zhang Xin-Yu;Xin Wei;Hao Ai-Min;Liu Ri-Ping

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采用基于密度泛函理论(DFT)的第一性原理计算方法,采用CASTEP规范中实现的平面波基集,研究了SrF2在高压下的结构稳定性、电子和光学性质。结果表明,SrF2的第二高压相为ni2in型结构,并表明SrF2的压力诱导相变顺序为萤石结构(Fm3m)→pbcl2型结构(Pnma)→ni2in型相(P63/mmc)。第一和第二相转变压力分别为5.77和45.58 GPa。在Fm3m阶段,能量间隙最初随着压力的增加而增加,在30gpa的Pnma阶段,能量间隙开始减小。在210 GPa以下,带隙重叠金属化不会发生。讨论了压力对光学性能的影响。
An investigation of structural stabilities, electronic and optical properties of SrF2 under high pressure is conducted using a first-principles calculation based on density functional theory (DFT) with the plane wave basis set as implemented in the CASTEP code. Our results predict that the second high-pressure phase of SrF2 is of a Ni2In-type structure, and demonstrate that the sequence of the pressure-induced phase transition of SrF2 is the fluorite structure (Fm3m) to the PbCl2-type structure (Pnma), and to the Ni2In-type phase (P63/mmc). The first and second phase transition pressures are 5.77 and 45.58 GPa, respectively. The energy gap increases initially with pressure in the Fm3m, and begins to decrease in the Pnma phases at 30 GPa. The band gap overlap metallization does not occur up to 210 GPa. The pressure effect on the optical properties is discussed.
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发表时间: 2007-04
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