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Compression behavior of the delafossite-type metallic oxide PdCoO2 below 10 GPa |
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| Authors: | M Hasegawa M TanakaT Yagi H TakeiA Inoue |
| Institution: | a Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan b Toshiba Corporation Semiconductor Company, Yokohama 235-8522, Japan c Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan d Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan |
| Abstract: | The compression behavior of delafossite-type metallic oxide PdCoO2 below 10 GPa has been investigated by in situ high pressure X-ray diffraction measurement using synchrotron radiation. It is found that the delafossite-type structure of PdCoO2 is stable below 10 GPa. It should be noted that compression behavior of PdCoO2 is anisotropic. Pressure dependence of the lattice parameters indicates that the a-axis is more compressible than the c-axis. The lattice parameter ratio c/a in the hexagonal unit increases with increasing pressure. The calculated zero-pressure bulk modulus is 224 GPa. It is found that the above characteristic compression behaviors of PdCoO2 are the same as those of the delafossite CuFeO2. The compressibilities of the a-axis of both PdCoO2 and CuFeO2 are highly different although those of the c-axis are almost the same. |
| Keywords: | 61 10 &minus i 61 66 Fn 62 50 +p |
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