Subsolidus phase relations in Na2O-CuO-Sb2On system and crystal structure of new sodium copper antimonate Na3Cu2SbO6 |
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| Authors: | OA Smirnova VB Nalbandyan AA Petrenko |
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| Institution: | a Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
b Chemistry Faculty, Department of General and Inorganic Chemistry, Rostov State University, Zorge 7, Rostov-on-Don 344090, Russian Federation |
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| Abstract: | Subsolidus phase relation studies in the NaSb3O7-Na3SbO4-CuO-CuSb2O6 quadrangle of Na2O-CuO-Sb2On system at 1123-1173 K revealed the formation of one new compound Na3Cu2SbO6. It is a superstructure derived from α-NaFeO2 type, space group C2/m, lattice constants: a=5.6759(1) Å, b=8.8659(1) Å, c=5.8379(1) Å, β=113.289(1)°. All ions are in octahedral environment, but CuO6 polyhedron exhibits strong elongation due to Jahn-Teller effect (Cu-O: 2.000(2) Å×2, 2.021(2) Å×2, 2.494(3) Å×2), whereas SbO6 octahedron is almost regular. The relationship to other similar superlattices is discussed. |
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| Keywords: | Antimonate Sodium copper antimony oxide Phase relations X-ray diffraction Rietveld refinement Jahn-Teller effect α-NaFeO2 type Superstructure Pseudosymmetry |
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