K2[Te4O8(OH)10]: synthesis,crystal structure and thermal behavior |
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| Affiliation: | 1. Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo 315211, China;2. Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China;3. College of Chemical and Material Engineering, Quzhou University, Quzhou 324000, China |
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| Abstract: | Dipotassium octaoxodecahydroxotetratellurate, K2[Te4O8(OH)10], has been prepared hydrothermally in acidic medium under autogenous pressure. It crystallizes in space group P21/c of the monoclinic system with Z=2 in a cell of dimensions a=5.592(1) Å, b=8.283(2) Å, c=16.255(3) Å, and β=99.62(3)°. The outstanding feature of the structure is a tetrameric [Te4O8(OH)10]2– anion built up from edge and corner sharing TeO6 octahedra. These anions and K+ cations are held together by electrostatic interactions and by hydrogen bonds. The compound decomposes in two steps at 350 and 420 °C, corresponding to a water and an oxygen loss, respectively, and affording the mixed valence oxide K2TeVI3TeIVO12. |
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