Crystal Field Interaction in Rare Earth Hydrides: EPR and Low Temperature Specific Heat Measurements
Rare earth metal hydrides represent an interesting group of interstitial compounds, especially with respect to their electronic properties and chemical bond mechanism. A remarkable feature is that they form phases which exist over considerable composition ranges. They are based on stoichiometries RH2 so-called dihydrides, and RH3, so-called trihydrides. The dihydrides RH2 exhibit the CaF2 — type structure, where the hydrogen atoms occupy nominally tetrahedral sites, whereas the trihydrides of the light rare earth elements crystallize with the BiF3 — type structure, where nominally octahedral sites are also occupied. In the ideal CaF2 and BiF3 structures the nearest neighbours of the metal ion are eight hydrogen atoms situated on the tetrahedral sites at the corners of the cube. The next — nearest neighbours are hydrogen atoms on the octahedral sites at the corners of an octahedron.
KeywordsOctahedral Site Tetrahedral Site Splitting Energy Light Lanthanide Element Crystal Field Splitting
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