高圧水素中における金属水素化物の電気抵抗測定技術及び鉄水素化物の電気伝導特性と結晶構造

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We present the newly developed electrical resistance measurement technique for metal hydrides compressed in high-pressure H2 and the first successful in-situ simultaneous measurements of electrical resistance and X-ray diffraction of FeH at high pressures and low temperatures. The electrical resistivity ρ showed a sharp increase with the formation of iron-hydride FeHx (x∼1) at 3.5 GPa. The ε′-phase of FeH was found to be metallic up to 25.5 GPa. The ρ vs. T curves up to 16.5 GPa approximately follow Fermi-liquid law below 25 K. However, T5 was found to be better fitting at 25.5 GPa. This change can be related to the previously reported ferromagnetism collapse at corresponding pressures.
2011-08-20