V E Antonov et al 2004 J. Phys.: Condens. Matter 16 8387 doi:10.1088/0953-8984/16/46/024
V E Antonov1,3, A I Latynin1 and M Tkacz2
Show affiliationsLines of formation and decomposition of the hcp (ε) molybdenum deuteride in the T–P phase diagram of the Mo–D system are constructed via the measurement of isotherms of the electrical resistance of molybdenum in a deuterium atmosphere at temperatures up to 550 °C and pressures up to 6 GPa. The diagram is compared to that of the Mo–H system studied earlier. The pressure of phase equilibrium in both systems is shown to be much closer to the decomposition pressure than to the formation pressure. A new explanation is suggested for this asymmetry in the hysteresis loop that seems to be characteristic of many metal–hydrogen systems. From the position of the decomposition lines, the standard entropy, enthalpy and Gibbs energy of formation are estimated for molybdenum deuteride and hydride.
81.30.Dz Phase diagrams of other materials
62.50.-p High-pressure effects in solids and liquids
Issue 46 (24 November 2004)
Received 27 July 2004, in final form 22 October 2004
Published 5 November 2004
V E Antonov et al 2004 J. Phys.: Condens. Matter 16 8387
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