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Title: Lattice dynamics of K{sub x}RhO{sub 2} single crystals

A series of crystals K{sub x}RhO{sub 2} (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 K{sub x}RhO{sub 2} for x = 0.72 and 0.63 are consistent with the theoretical prediction for the stoichiometric KRhO{sub 2}. 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.
Authors:
; ; ; ; ; ; ;  [1] ;  [2] ;  [3] ;  [4] ;  [5]
  1. National Laboratory of Solid State Microstructures and Department of Materials Science and Engineering, Nanjing University, Nanjing 210093 (China)
  2. College of Chemistry & Chemical and Environmental Engineering, Weifang University, Weifang, 261061 (China)
  3. National Laboratory of Solid State Microstructure and Department of Physics, Nanjing University, Nanjing 210093 (China)
  4. Departamento de Física, Universidade Federal do Ceará, Campus do Pici, CP 6030, Fortaleza CE 60455-760 (Brazil)
  5. Bragg Institute, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW 2234 (Australia)
Publication Date:
OSTI Identifier:
22492294
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 8; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CONCENTRATION RATIO; CRYSTAL LATTICES; DENSITY OF STATES; INELASTIC SCATTERING; MONOCRYSTALS; NEUTRON DIFFRACTION; PHONONS; POTASSIUM COMPOUNDS; RAMAN SPECTROSCOPY; RHODIUM OXIDES; STOICHIOMETRY; SYMMETRY