We investigated the crystal structures of two hydrides formed from a BCC solid solution alloy Ti1.0V1.1Mn0.9 by means of neutron and X-ray powder diffraction. The mono-hydride (Ti1.0V1.1Mn0.9)D2.0 has a pseudo-cubic NaCl structure. The lattice constants are a′ = 0.41278(4) nm and c′ = 0.37685(6) nm, where the c′-axis is 9% shorter than the a′-axis. In this phase the hydrogen atoms occupy octahedral (O) sites surrounded by six metal atoms. The di-hydride (Ti1.0V1.1Mn0.9)D5.4 has the CaF2 structure (a = 0.431935(5) nm) with hydrogen atoms occupying tetrahedral (T) sites. The mono-hydride found in this study is classified into a new category: `a NaCl-type mono-hydride formed from BCC solid solution'.
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