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Formation of a novel TiFe hydride and estimation of its hydrogen content at high pressures and temperatures

高温高圧下における新規TiFe水素化物の合成とその水素量評価

遠藤 成輝; 松本 愛子*; 中村 優美子*; 齋藤 寛之; 町田 晃彦; 片山 芳則

Endo, Naruki; Matsumoto, Itoko*; Nakamura, Yumiko*; Saito, Hiroyuki; Machida, Akihiko; Katayama, Yoshinori

We investigated the hydrogenation of a CsCl-type TiFe alloy at 5 GPa and 600$$^{circ}$$C by in situ synchrotron radiation X-ray diffraction measurements. An order-disorder phase transition from CsCl-type solid solution to BCC-type hydride was observed. The BCC hydride had the maximum volume expansion of 21.0%, which is larger than that of a full-hydride TiFeH$$_{1.9}$$ ($$gamma$$ phase) prepared by hydrogenation near ambient conditions. The BCC phase could not be recovered at ambient conditions. In order to estimate the hydrogen content of the BCC hydride, we tried to compare its lattice volume with the lattice volume of $$gamma$$ hydride at same high pressure and high temperature conditions. As a result, the lattice volume of BCC phase was almost equal to that of $$gamma$$ hydride, therefore, the hydrogen content of BCC phase was almost equal to that of $$gamma$$ hydride (H/M$$sim$$1).

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