Infrared and Raman Spectra of Non‐Stoichiometric Cerium Hydrides

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Abstract
Infrared reflectivity and Raman spectra of CeHx; (2 < x < 3) are reported. Some of phonon features in the spectra shift with the hydrogen concentration. The spectra are analyzed in terms of lattice vibrations of supercells which simulate non‐stoichiometric CeHx. Force constants thus obtained show that the hydrogen atoms at octahedral sites are more weakly bound than those at tetrahedral sites. Anomalous changes in the force constants are suggested to account for the observed shifts.

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