Abstract
NaZr2–xBx(PO4)3–2x(SO4)2x (0 ≤ x ≤ 1.25, B = Mg, Co, Ni, Cu, Zn), and NaZr2–xRx(PO4)3–x(SO4)x (0 ≤ x ≤ 1.25, R = Al, Fe) phosphate-sulfates series have been prepared by a sol–gel process. These compounds belong to the NaZr2(PO4)3 (NZP) structure family and crystallize in hexagonal crystal system, space group R\(\bar 3\)c. Limited solid solution series were found to exist; their formation temperatures and thermal stability limits were determined. Particle sizes as determined by microstructure observation were 50–200 nm, and for Cu- and Zn-containing samples, 200–500 nm. The thermal expansion of phosphate-sulfate NaZr1.25Cu0.75(PO4)1.5(SO4)1.5 was studied in the range 25–700°C. Thermal expansion coefficients and thermal expansion anisotropy were found to be αa =–5.40 × 10–6 °C–1, αс = 18.88 × 10–6 °C–1, αavg = 2.69 × 10–6 °C–1, and Δα = 24.28 × 10–6 °C–1.
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Original Russian Text © D.O. Savinykh, S.A. Khainakov, A.I. Orlova, S. Garcia-Granda, 2018, published in Zhurnal Neorganicheskoi Khimii, 2018, Vol. 63, No. 6, pp. 685–694.
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Savinykh, D.O., Khainakov, S.A., Orlova, A.I. et al. New Phosphate-Sulfates with NZP Structure. Russ. J. Inorg. Chem. 63, 714–724 (2018). https://doi.org/10.1134/S0036023618060207
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DOI: https://doi.org/10.1134/S0036023618060207