Lattice Dynamics of Semiconducting, Metallic, and Superconducting Ba1-xKxBiO3 Studied by Inelastic Neutron Scattering

Mark A. Green, Kosmas Prassides, D. A. Neumann, Peter Day

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Inelastic neutron scattering has been used to study the lattice dynamics in Ba1-xKxBiO3 over a wide range of compositions, covering regions of the [composition (x), temperature (T)] phase diagram displaying semiconducting, metallic, and superconducting behavior. Modes are assigned using interatomic potentials calculations, which show good agreement with experiment. The oxygen phonon modes are very sensitive to changes in composition and oxidation state of the Bi ions. Phonon anomalies observed in both the oxygen TO bending (~33 meV) and stretching (~62 meV) modes as a function of temperature are discussed within the context of the BCS theory. Novel behavior is shown by the LO oxygen bending mode at ~42 meV that shows a strong dependence on composition, proposed to arise from the occurrence of structural phase transitions in this system.

Original languageEnglish
Pages (from-to)888-893
Number of pages6
JournalChemistry of Materials
Issue number5
Publication statusPublished - 1995 May

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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