Lattice dynamics of semiconducting, metallic, and superconducting Ba1-xKxBiO3 studied by inelastic neutron scattering

Green, M.A. and Prassides, K. and Neumann, D.A. and Day, P. (1995) Lattice dynamics of semiconducting, metallic, and superconducting Ba1-xKxBiO3 studied by inelastic neutron scattering. Chemistry of Materials, 7 (5). pp. 888-893. ISSN 08974756 (ISSN). E-ISSN 1520-5002. (doi:https://doi.org/10.1021/cm00053a012) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
https://doi.org/10.1021/cm00053a012

Abstract

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. © 1995 American Chemical Society.

Item Type: Article
Additional information: Unmapped bibliographic data: LA - English [Field not mapped to EPrints] AD - Royal Institution of Great Britain, 21 Albemarle Street, London W1X 4BS, United Kingdom [Field not mapped to EPrints] AD - School of Chemistry and Molecular Science, Sussex University, Brighton BN1 9QJ, United Kingdom [Field not mapped to EPrints] AD - Reactor Radiation Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, United States [Field not mapped to EPrints] DB - Scopus [Field not mapped to EPrints]
Subjects: Q Science > QC Physics > QC173.45 Condensed Matter
Q Science > QD Chemistry > QD478 Solid State Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Giles Tarver
Date Deposited: 21 Oct 2015 11:34 UTC
Last Modified: 21 Jan 2016 12:08 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/51166 (The current URI for this page, for reference purposes)
  • Depositors only (login required):