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In contrast to V$_2$D, V$_2$H exhibits two phase transitions, from ordered monoclinic β to disordered tetragonal β′ and from β′ to disordered bcc α. In the transition β −β′ the hydrogens presemably remain in one set of octaheiral sites but disorder within this set. The induced vanadium atom modulation thereby disappears although the tetragonal structure remains. Using the metal‐atom (1/2, 0, 1/2) modulation the long‐range order is studied with X‐rays as a function of temperatures and is shown to diminish continuously in a second‐order fashion up to Tc=168 °C. Strong short range order diffuse intensity has been observed in the β′‐phase

physical review. b, condensed matter

Long-range order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">V</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>H near the β<i>-</i>ε phase transition

Long-range order inV2H near the β-ε phase transition