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Title

Polarization optical, electric and neutron scattering studies of the perovskite lead cobalt tungstate (Pb2CoWO6)
Authors
Brixel, Wolf Dietrich
Werk, Margit
Fischer, Peter
Bührer, Willi
Rivera, Jean-Pierre
Tissot, Paul
Schmid, Hans
Published in Japanese Journal of Applied Physics. 1985, vol. 24, p. 242-244
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)
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Structures
Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée
Project FNS: 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. https://archive-ouverte.unige.ch/unige:30946

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Deposited on : 2013-11-05

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