Les niobates CaUNb2O8 et MThNb2O8 (M = Ca,Sr, Cd). Etude des transformations monoclinique - quadratique |
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| Authors: | Gilles Fonteneau Hervé L&#x;Helgoualch Jacques Lucas |
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| Affiliation: | Laboratoire de Chimie Minérale D, Université de Rennes, Laboratoire Associé au C.N.R.S. no 254, Avenue du Général Leclerc, 35031 Rennes Cédex, France |
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| Abstract: | New compounds MIIThNb2O8 with MII = Ca, Sr, Cd, and CaUNb2O8 have been prepared by solid state reaction. These compounds isotypic with the rare-earth niobates LnNbO4 cristallize in a monoclinic system with space group I2/c. Like the niobates LnNbO4, they present a displacive and non quenchable transition (monoclinic to tetragonal) which is probably of second order. |
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