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Comparative Study on Pressure-Induced Structural Changes between C 6 O 2 I 4 and C 6 I 6 |
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| Authors: | A Nakayama H Fujihisa K Takemura K Aoki R P Carlón |
| Institution: | 1. National Institute of Advanced Industrial Science and Technology , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki , 305-8565 , Japan E-mail: atsuko-nakayama@aist.go.jp;2. National Institute of Advanced Industrial Science and Technology , Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki , 305-8565 , Japan;3. National Institute for Materials Science , 1-1 Namiki, Tsukuba, Ibaraki , 305-0044 , Japan;4. Departmento de Química Organometálica , Universidad de Oviedo , Oviedo , 33071 , Spain |
| Abstract: | We have investigated the pressure effects on the structural properties of C 6 O 2 I 4 up to 39 GPa by powder x-ray diffraction measurements, which were compared with those of C 6 I 6 . The diffraction patterns of C 6 O 2 I 4 indicated a phase transition starting at 26.8 GPa. The mixed state of the low- and high-pressure phases continued up to 39 GPa well above an insulator-to-metal transition pressure of 33 GPa. The C 6 O 2 I 4 molecule remains planar structure in the low-pressure phase below 26.8 GPa in contrast to the non-planar molecular structure of C 6 I 6 at ambient and high pressures. |
| Keywords: | Pressure-induced Metallization Iodanil Hexaiodobenzene Phase Transition X-ray Powder Diffraction Rietveld Analysis |