Stability of the Hydrogen Absorption and Desoption Plateaux in LaNis-H Part 3: Experimental Observations of Compositional Inhomogeneities Due to Temperature Gradients

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KISI, EH
GRAY, EM
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1995
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It has been predicted by Pons and Dantzer that temperature gradients due to the released enthalpy of H absorption-desorption will generate macroscopic inhomogeneities of the αβ phase proportions in metal hydrides. We used in situ X-ray diffraction and in situ neutron diffraction respectively to study the growth of β-LaNi5H at the free surface, and β-LaNi5-D in the bulk of powdered samples. It was found that a macroscopic compositional inhomogeneity does occur, and can be so severe that the free surface of the sample remains pure α phase while the bulk of the sample is rich in β phase.

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Journal of Alloys and Compounds

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217

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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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