Etude des phases ferroelastiques de Pb3V2O8 : Determination de la maille cristalline de la phase α ferroelectrique basse temperature |
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Authors: | P. Garnier G. Calvarin J.F. Berar D. Weigel |
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Affiliation: | Laboratoire de Chimie-Physique du Solide, E.R.A. au C.N.R.S. no456 Ecole Centrale des Arts et Manufactures Grande Voie des Vignes, 92290 Châtenay-Malabry - France |
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Abstract: | The cell parameters of the ferroelastic and ferroelectric phase of Pb3V2O8 (T < 262 K) have been determined by very accurate X-ray powder diffractometry ; at 77 K, , , and . This monoclinic cell is characterized by Z = 2 and the space group is A2. Thermal expansion tensors have been measured versus temperature for the three phases α (T < 262K), β (262K < T < 360 K) and γ (T > 360 K). The intermediate phase β is characterized by an important thermal expansion anisotropy and its molecular volume is higher than that of the two other phases α and γ. |
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