Extension of the La7Mo7O30 structural type with La7Nb3W4O30 and La7Ta3W4O30 compounds |
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| Authors: | F Goutenoire S Kodjikian |
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| Institution: | a Laboratoire des Oxydes et Fluorures, UMR-CNRS 6010, Université du Maine, 72085 Le Mans cedex 9, France
b Institut Laue Langevin, Avenue des Martyrs, B.P 156, 38042 Grenoble Cedex 9, France |
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| Abstract: | Two compounds of formula La7A3W4O30 (with A=Nb and Ta) were prepared by solid-state reaction at 1450 and 1490 °C. They crystallize in the rhombohedric space group R-3 (No. 148), with the hexagonal parameters:  ,  and  ,  . The structure of the materials was analyzed from X-ray, neutron and electronic diffraction. These oxides are isostructural of the reduced molybdenum compound La7Mo7O30, which are formed of perovskite rod along 111]. An order between (Nb, Ta) and W is observed. |
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| Keywords: | Perovskite X-ray and neutron diffraction Electron microscopy BVS |
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