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Polarization optical, electric and neutron scattering studies of the perovskite lead cobalt tungstate (Pb2CoWO6)

Published inJapanese journal of applied physics, vol. 24, no. Suppl. 24-2, Proc. Int. Meet. Ferroelectr., 6th, p. 242-244
Publication date1985
Abstract

Flux-grown single crystals of the elpasolite-like perovskite Pb2CoWO6 were characterized by polarized light microscopy, electric conductivity, ferroelectric polarization, elastic and inelastic neutron scattering, and DSC. A sequence of 4 phases is found: cubic, Fm3m(I) ↔ (at ∼298 K) monoclinic, incommensurate(II) ↔ (at ∼235 K) ferroelectric(III) ↔ (at 9 K) ferromagnetic/ferroelectric(IV). The transitions II/III and I/II are of first order with the respective latent heats: 290 and 840 J/mol Pb2CoWO6. The structure of phase I was refined with the Rietveld system program, using the 306 K neutron diffraction data. In this phase, a soft phonon mode with wave vector q along Σ has been observed, which condenses near the zone boundary point X.

Keywords
  • Crystal lattice dynamics
  • Heat of transition (of lead cobalt tungstate)
  • Electric conductivity and conduction
  • Ferroelectricity (of lead cobalt tungstate perovskite)
Funding
  • Swiss National Science Foundation - 1984
Citation (ISO format)
BRIXEL, Wolf Dietrich et al. Polarization optical, electric and neutron scattering studies of the perovskite lead cobalt tungstate (Pb2CoWO6). In: Japanese journal of applied physics, 1985, vol. 24, p. 242–244.
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Article (Published version)
accessLevelPublic
Identifiers
  • PID : unige:30946
Journal ISSN0021-4922
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804downloads

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