High-Pressure Phase Transformation of Cobalt Monoxide Due to Electronic Transition.

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  • Noguchi Yuichi
    Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba–ku, Sendai 980–8577, Japan
  • Atou Toshiyuki
    Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba–ku, Sendai 980–8577, Japan
  • Kondo Tadashi
    Institute for Solid State Physics, University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666, Japan
  • Yagi Takehiko
    Institute for Solid State Physics, University of Tokyo, 7–22–1 Roppongi, Minato–ku, Tokyo 106–8666, Japan
  • Syono Yasuhiko
    Institute for Materials Research, Tohoku University, 2–1–1 Katahira, Aoba–ku, Sendai 980–8577, Japan

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  • High Pressure Phase Transformation of Cobalt Monoxide Due

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High-pressure behavior of rocksalt-type CoO was investigated by shock and static experiments up to 106 and 131 GPa, respectively. A phase transition was detected at 81± 1 GPa from the measurements of shock compression curve. X-ray diffraction study under static high-pressure revealed two phase transitions at about 80 GPa and 120 GPa. The crystal structure of both high-pressure phases was closely related to the rocksalt structure. The volume decrease accompanied by the phase transition was estimated to be about 5%. The high-pressure phase was reversibly transformed to the ambient phase on unloading. From comparison of recent first principle calculations, electronic transition with magnetic collapse in Co2+ was inferred.

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