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Zhao, Jinggeng; Wang, Luhong; Dong, Dawei; Liu, Zhiguo; Liu, Haozhe; Chen, Genfu; Wu, Dan; Luo, Jianlin; Wang, Nanlin; Yu, Yong; Jin, Changqing; Guo, Quanzhong
Journal of the American Chemical Society, 10/2008, Volume: 130, Issue: 42Journal Article
The high-pressure angle-dispersive X-ray diffraction experiments on the iron-based superconductor Nd(O0.88F0.12)FeAs were performed up to 32.7 GPa at room temperature. An isostructural phase transition starts at ∼10 GPa. When pressure is higher than 13.5 GPa, Nd(O0.88F0.12)FeAs completely transforms to a high-pressure phase, which remains the same tetragonal structure with a larger a-axis and smaller c-axis than those of the low-pressure phase. The ambient conditions isothermal bulk moduli B 0 are derived as 102(2) and 245(9) GPa for the low-pressure phase and high-pressure phase, respectively. The structure analysis based on the Rietveld refinement methods shows the difference of pressure dependence of the Fe−As and Nd−(O, F) bonding distances, as well as As−Fe−As and Nd−(O, F)−Nd angles between the low-pressure phase and high-pressure phase.
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