Structural Instability of Unfilled Skutterudite Compounds \mathit{MX}_{3} (M = Co, Rh, and Ir; X = As and Sb) under High Pressure

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概要

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• Powder X-ray diffraction patterns of the binary unfilled skutterudite compounds \mathit{MX}_{3} (M = Co, Rh, and Ir; X = As and Sb) have been studied under high pressures up to 60 GPa, using synchrotron radiation and a diamond anvil cell. The X-ray diffraction patterns of \mathit{MX}_{3} above a critical pressure show anomalous reductions in the intensities of several Bragg peaks. Furthermore, the pressure-volume curves of \mathit{MX}_{3} reveal a saturation behavior of the volume reduction with pressure. Upon pressure release, \mathit{MX}_{3} exhibit a volume greater than those of pristine compounds. This anomalous behavior could be interpreted as a pressure-induced self-insertion reaction. Furthermore, the high-temperature and high-pressure phase diagram of RhSb3 was obtained. The structural instability of \mathit{MX}_{3} under high pressures is discussed.

• 2012-10-15

著者

• Takeda Keiki

  Graduate School Of Engineering Science Osaka University:(present Office)department Of Engineering Mu

• Yamamoto Keiichi

  Graduate Course Of Applied Chemistry Sojo University

• Kawamura Yukihiro

  Graduate School of Integrated Arts and Science, Kochi University, Kochi 780-8520, Japan

• Sekine Chihiro

  Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585

• Takeda Keiki

  Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan

• MATSUI Kazuki

  Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan

• KAWAAI Takuma

  Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan

• Hayashi Junichi

  Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan

• Kawamura Yukihiro

  Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan

• Yamamoto Keiichi

  Graduate School of Engineering, Muroran Institute of Technology, Muroran, Hokkaido 050-8585, Japan

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