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Hydrogen Ordering and Metal-Semiconductor Transitions in Rare-Earth Hydrides

Published online by Cambridge University Press:  20 February 2017

P. Vajda
P. Vajda*
Affiliation:
Laboratoire des Solides Irradiés, Ecole Polytechnique, F-91128 Palaiseau, France
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Abstract

After an introduction to the rare earth – hydrogen phase diagram, stressing the often broad existence range of the solid solution (α), dihydride (β) and trihydride (γ) phases, we are describing in detail the fluorite-type dihydride and its superstoichiometric composition, RH2+x, where the x atoms occupy the available octahedral interstitial sites. It is shown how these additional x atoms interact with each other to form ordered H superlattices (sometimes distorting the cubic CaF2 structure) and how the latter influences the electronic structure of the systems modifying the magnetic properties and/or leading to metal-semiconductor transitions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1122: Symposium O – Structure/Property Relationships in Fluorite-Derivative Compounds , 2008 , 1122-O01-04
Copyright
Copyright © Materials Research Society 2009

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References

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