Synthesis and crystal structures of the manganous antimonates Mn2Sb2O7 and MnSb2O6 |
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| Institution: | 1. Chemistry Department, Faculty of Science, University of Jeddah, Jeddah, Saudi Arabia\n;2. Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt\n;3. Chemistry Department, Faculty of Science, Damanhour University, Damanhour, Egypt\n |
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| Abstract: | Mn2Sb2O7 has been prepared by the solid state reaction of MnCO3 and Sb2O3 at 1100°C, and its crystal structure determined from X-ray powder diffraction data. The compound is trigonal P3121 with a = 7.191, c = 17.398 Å, and the structure is fluorite-related, but not a distorted pyrochlore. The relationship between this structure and that of pyrochlore is discussed. MnSb2O6 was formed as a reaction intermediate and its structure has also been determined. This phase is trigonal P321 with a structure related to that of Na2SiF6 and is apparently a new polymorph, since MnSb2O6 has previously been stated to have either the orthorhombic columbite or the tetragonal trirutile structure. |
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