Journal
INORGANIC CHEMISTRY
Volume 53, Issue 21, Pages 11616-11625Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ic501770g
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Funding
- World Premier International Research Center Initiative of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS) [22340163, 25287145, 24360275, 25289233]
- Advanced Low Carbon Technology Research and Development Program (ALCM of the Japan Science and Technology Agency (JST)
- Grants-in-Aid for Scientific Research [25287145] Funding Source: KAKEN
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The polycrystalline MO2's (HP-PdF2-type MO2, M = Rh, Os, Pt) with high-pressure PdF2 compounds were successfully synthesized under high-pressure conditions for the first time, to the best of our knowledge. The crystal structures and electromagnetic properties were studied. Previously unreported electronic properties of the polycrystalline HP-PdF2-type RuO2 and IrO2 were also studied. The refined structures clearly indicated that all compounds crystallized into the HP-PdF2-type structure, M4+O22-, rather than the pyrite-type structure, Mn+(O-2)(n-) (n < 4). The MO2 compounds (M = Ru, Rh, Os, Ir) exhibited metallic conduction, while PtO2 was highly insulating, probably because of the fully occupied t2g band. Neither superconductivity nor a magnetic transition was detected down to a temperature of 2 K, unlike the case of 3d transition metal chalcogenide pyrites.
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