Abstract
A series of crystals KxRhO2 (x = 0.72, 0.63, 0.55, 0.39, and 0.24) have
been synthesized and their vibrational properties have been studied by
first principles calculations, Raman spectroscopy, and inelastic neutron scattering. The measured vibrational spectra of KxRhO2 for x = 0.72 and
0.63 are consistent with the theoretical prediction for the stoichiometric KRhO2. For samples with x = 0.55, 0.39 and 0.24, extra
vibrational modes have been observed and they are believed to be due to
the symmetry reduction and the loss of translational symmetry induced by
K disorder. The good agreement was found for the phonon density of
states among the Raman spectroscopic observations, inelastic neutron
scattering and the first principles calculations, as an evidence for the
generation of structure disorder by K deficiency. (C) 2015 Author(s).
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