A Neutron Diffraction Investigation of the LaNi5-D Phase Diagram.

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KISI, EH
GRAY, EMA
KENNEDY, SJ
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1994
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Abstract

Phase boundaries in the LaNi5D system determined by in situ neutron diffraction experiments have shown good agreement with those predicted from the LaNi5D 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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Journal of Alloys and Compounds

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216

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1

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Physical sciences

Condensed matter physics

Materials engineering

Resources engineering and extractive metallurgy

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