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arXiv 1107.1193cond-mat.mtrl-sci
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室温高压下形成的Na-Au金属间化合物

Na-Au intermetallic compounds formed under high pressure at room temperature

K. Takemura, H. Fujihisa

摘要:

高压粉末X射线衍射实验表明,钠和金在室温下反应,并在高压下形成新的Na-Au金属间化合物。我们已经确定了四个金属间相高达60 GPa。第一相(相I)是已知的具有四重CuAl 2型结构的Na 2Au。在0.8GPa左右转变为第二相(相II),其成分为Na 3Au,具有三角Cu 3As型或六方Cu 3 P型结构。在3.6 GPa时,第II相进一步转变为第III相。相III具有与立方BiF 3型结构相同的成分Na 3Au。最后,第三阶段在54 GPa左右转变为第四阶段。相IV给出宽的衍射峰,表明大的结构无序。

英文摘要:

High-pressure powder x-ray diffraction experiments have revealed that sodium and gold react at room temperature and form new Na-Au intermetallic compounds under high pressure. We have identified four intermetallic phases up to 60 GPa. The first phase (phase I) is the known Na2Au with the tetragonal CuAl2-type structure. It changed to the second phase (phase II) at about 0.8 GPa, which has the composition Na3Au with the trigonal Cu3As-type or hexagonal Cu3P-type structure. Phase II further transformed to phase III at 3.6 GPa. Phase III has the same composition Na3Au with the cubic BiF3-type structure. Finally, phase III changed to phase IV at around 54 GPa. Phase IV gives broad diffraction peaks, indicating large structural disorder.

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