Struture Stability and Compressibility of Iron-Based Superconductor Nd(O0.88F0.12)FeAs under High Pressure

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• 作者：Jinggeng Zhao ; Luhong Wang ; Dawei Dong ; Zhiguo Liu ; Haozhe Liu ; Genfu Chen ; Dan Wu ; Jianlin Luo ; Nanlin Wang ; Yong Yu ; Changqing Jin ; Quanzhong Guo
• 刊名：Journal of the American Chemical Society
• 出版年：2008
• 出版时间：October 22, 2008
• 年：2008
• 卷：130
• 期：42
• 页码：13828-13829
• 全文大小：132K
• 年卷期：v.130,no.42(October 22, 2008)
• ISSN：1520-5126

文摘

The high-pressure angle-dispersive X-ray diffraction experiments on the iron-based superconductor Nd(O_0.88F_0.12)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(O_0.88F_0.12)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 B₀ 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.