La6Mo8O33: a new ordered defect scheelite superstructure |
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| Authors: | V Brizé ,S Kodjikian,F Goutenoire |
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| Affiliation: | a Faculté des Science, Laboratoire des Fluorures, UMR-CNRS 6010, Université du Maine, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, Franceb Institut Laue Langevin, Avenue des Martyrs, B.P 156, 38042 Grenoble Cedex 9, France |
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| Abstract: | The structure of La6Mo8O33 has been determined from a triple pattern powder diffraction analysis. Two high-resolution neutron diffraction patterns collected at 1.594 and 2.398 Å and one X-rays were used. This molybdate crystallizes in a non-centrosymmetric monoclinic space group P21(N°4), Z=2,a=10.7411(3) Å, b=11.9678(3) Å, c=11.7722(3) Å, β=116.062 (1)°. La6Mo8O33 is an unusual ordered defect Scheelite. Hence, it should be described with cation vacancies and an extra oxygen atom following the formula: La6□2Mo8O32+1. This extra oxygen atom leads to a pyramidal environment, whereas the other molybdenum atoms present tetrahedral environment. A molybdenum tetrahedral is connecting to the pyramid, forming an [Mo2O9] unit. |
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| Keywords: | Ordered defect Scheelite Structural determination High-resolution electron microscopy X-ray and neutron diffraction |
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