High pressure-induced phase transitions in CdS up to 1 Mbar

High pressure-induced phase transitions in CdS up to 1 Mbar
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CdS 中高达 1 Mbar 的高压引起的相变

DOI:
10.1063/1.4792233
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发表时间:
2013-02
影响因子:
3.2
通讯作者:
Liu, Jing
Liu, Jing
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li, Yanchun;Zhang, Xiaona;Li, Hui;Li, Xiaodong;Lin, Chuanlong;Xiao, Wangsheng;Liu, Jing

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用同步辐射x射线衍射法和密度泛函理论计算研究了在高达104 Gpa的金刚石顶压室中压致硫化镉的结构转变。X射线衍射实验表明,在常温下,硫化镉具有纤锌矿结构,是稳定的。在3 GPa时,纤锌矿型相转变为NaCl型结构,52.3 GPa时发生第二次相变。在衍射谱中观察到了峰分裂,表明在52.3 GPa处出现的高压相是PmMN结构,而不是先前报道的CMCM相。随着压力的增加,PmMn相的晶格参数a反常增大,而b轴和c轴减小。我们的计算表明,a轴的反常变化可能与压力引起的晶体结构变化有关。纤锌矿型相的体弹性系数(B-0)为64.3(9)GPa.氯化盐型相为105(2)GPA,PmMN相为54(4)GPa.(C)2013年美国物理研究所。[http://dx.doi.org/10.1063/1.4792233]
The pressure-induced structural transformations of CdS have been investigated using synchrotron x-ray diffraction in a diamond anvil cell up to 104 GPa and the density functional theory calculations. The x-ray diffraction experiments show that CdS is stable with the wurtzite-type structure at ambient conditions. The wurtzite-type phase transforms to NaCl-type structure at 3 GPa, which is followed by a second phase transition at 52.3 GPa. In the diffraction patterns, the peak-splitting is observed, indicating that the high-pressure phase appearing at 52.3 GPa is the Pmmn structure, rather than the Cmcm phase reported earlier. With increasing pressure, the lattice parameter a of the Pmmn phase increases abnormally, contrary to decrease of b and c axes. Our calculations reveal that the abnormal change of the a-axis could be related to the pressure-induced crystal structural change. The bulk modulus (B-0), is 64.3(9) GPa for wurzite-type phase, 105(2) GPa for NaCl-type phase, and 54(4) GPa for the Pmmn phase, respectively. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4792233]
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