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Title

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

Authors
Fischer, Peter
Bührer, Willi
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 dynamicsHeat of transition (of lead cobalt tungstate)Electric conductivity and conductionFerroelectricity (of lead cobalt tungstate perovskite)
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Project FNS: 1984
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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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