Abstract
Phase boundaries in the LaNi 5D system determined by in situ neutron diffraction experiments have shown good agreement with those predicted from the LaNi 5D pressure—composition phase diagram by intersecting extrapolated pressure plateaux and pure phase isotherms. Lattice parameter measurements show strong dilational strain in the α phase and severe compressive strain in the β phase in the two-phase region. In addition, there are systematic changes in linewidths in the two-phase region. Taken together, these provide strong evidence that the partially hydrided powder is microscopically inhomogeneous, i.e. individual micron-sized particles contain coexisting nanoscale α and β phase domains. The alternative model, consisting of a mixture of particles which are wholly α and particles which are wholly β phase, is not supported by these data. We observed hysteresis in the lattice parameters of the β phase and the linewidths of the α phase in the two-phase region, implying a fundamental asymmetry in the D absorption and desorption mechanisms.
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