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High-pressure transformations of NbO2F

机译:NbO2F的高压转变

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摘要

The ReO3-type structure NbO2F, niobium dioxyfluoride, has been studied at high pressures using diamond anvil cells and synchrotron X-ray radiation. High-pressure powder diffraction measurements have been performed up to 40.1 GPa. A phase transition from the cubic (Pm (3) over bar m) ambient pressure structure to a rhombohedral (R (3) over bar c) structure at 0.47 Cpa has been observed. Rietveld refinements at 1.38, 1.96, 3.20, 6.23, 9.00 and 10.5 GPa showed that the transition involves an a(-)a(-)a(-) tilting of the cation-anion coordination octahedra and a change of the anion-anion arrangement to approach hexagonal close packing. Compression and distortion of the Nb(O/F)(6) octahedra is also revealed by the Rietveld refinements. At 17-18 Gpa, the diffraction pattern disappears and the structure becomes X-ray amorphous. [References: 39]
机译:ReO3型结构NbO2F,二氧化铌是在高压下使用金刚石砧盒和同步加速器X射线辐射进行研究的。已进行了高达40.1 GPa的高压粉末衍射测量。已经观察到在0.47 Cpa时从立方(Pm(3)超过bar m)环境压力结构到菱形(R(3)超过bar c)结构的相变。 Rietveld对1.38、1.96、3.20、6.23、9.00和10.5 GPa的精炼表明,过渡过程涉及阳离子阴离子配位八面体的a(-)a(-)a(-)倾斜和阴离子-阴离子排列的变化接近六角密堆积。 Rietveld改进也揭示了Nb(O / F)(6)八面体的压缩和变形。在17-18 Gpa时,衍射图消失,结构变成X射线非晶态。 [参考:39]

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