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Melting of 3d transition metal-hydrogen systems under high pressure

高圧下における3d遷移金属-水素系の融解

片山 芳則; 齋藤 寛之; 青木 勝敏

Katayama, Yoshinori; Saito, Hiroyuki; Aoki, Katsutoshi

3d遷移金属水素合金の融解と液体の構造を調べるために、高温高圧下で水素化Ti, V, Mn, Fe, Co, NiのX線回折実験を行った。実験はSPring-8のビームラインBL14B1に設置されたキュービック型マルチアンビルプレスを用いた。出発物質は、TiとVについてはTiH$$_{2}$$とVH$$_{2}$$、Mn, Fe, Co, Niに関しては純金属である。試料を熱分解窒化ホウ素のカプセルに入れ、それをさらに水素源とともにNaCl製のカプセルに入れた。これを約4GPaまで加圧し、加熱した。TiH$$_{2}$$とVH$$_{2}$$については、明確な融解を確認できなかったが、Mn, Fe, Co, Niについては融解を観測することができ、Fe, Co, Niについては融点降下が確認された。金属原子間の最近接距離は、水素化によって伸びた。

To study melting behavior and structure of liquid 3d transition metal-hydrogen alloys, we have performed X-ray diffraction measurements under high-pressure high-temperature conditions for hydrogenated Ti, V, Mn, Fe, Co and Ni. Experiments were performed using a cubic-type multi-anvil press installed on BL14B1 at SPring-8. Starting materials were TiH$$_{2}$$ and VH$$_{2}$$ for Ti and V, respectively, and pure metals for Mn, Fe, Co and Ni. The sample was put in a capsule made of pyrolytic BN and then inserted in a NaCl capsule together with hydrogen source. The sample was heated at about 4 GPa. We did not observe any indications of melting for TiH$$_{2}$$ and VH$$_{2}$$ while we observed liquid pattern for hydrogenated Mn, Fe, Co and Ni. The decrease of melting temperature was confirmed for Fe, Co and Ni. The nearest neighbor distance between the metal atoms elongated due to the hydrogenation.

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