Synthesis,structure, and thermal expansion of sodium zirconium arsenate phosphates |
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| Authors: | M. V. Sukhanov V. I. Pet’kov D. V. Firsov V. S. Kurazhkovskaya E. Yu. Borovikova |
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| Affiliation: | 1.Nizhni Novgorod State University,Nizhni Novgorod,Russia;2.Moscow State University,Vorob’evy gory, Moscow,Russia |
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| Abstract: | Sodium zirconium arsenate phosphates NaZr2(AsO4) x (PO4)3?x were synthesized by precipitation technique and studied by X-ray diffraction and IR spectroscopy. In the series of NaZr2(AsO4) x (PO4)3?x , continuous substitution solid solutions are formed (0 ≤ x ≤ 3) with the mineral kosnarite structure. The crystal structure of NaZr2(AsO4)1.5(PO4)1.5 was refined by full-profile analysis: space group R (bar 3) c, a = 8.9600(4)Å, c = 22.9770(9) Å, V = 1597.5(1) Å3, R wp = 4.55. The thermal expansion of the arsenate-phosphate NaZr2(AsO4)1.5(PO4)1.5 and the arsenate NaZr2(AsO4)3 was studied by thermal X-ray diffraction in the temperature range of 20–800°C. The average linear thermal expansion coefficients (αav = 2.45 × 10?6 and 3.91 × 10?6 K?1, respectively) indicate that these salts are medium expansion compounds. |
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