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- Title
Synthesis, phase transitions, and thermal expansion in arsenate-phosphate solid solution with garnet structure.
- Authors
Pet'kov, Vladimir I.; Piaterikov, Egor A.; Fukina, Diana G.
- Abstract
The new polycrystalline phases of variable composition Na 3 Cr 2 (AsO 4) x (PO 4) 3 - x were synthesized by co-precipitation of metal salts, arsenic acid, and ammonium hydrophosphate from an aqueous solution, followed by heat treatment. The obtained samples were examined using XRD, TG − DSC, SEM, and microprobe analysis. The Na 3 Cr 2 (AsO 4) x (PO 4) 3 - x solid solution (1.75 ≤ x ≤ 3.0) exhibits dimorphism at elevated temperatures: low-temperature modification with garnet structure is obtained at 873–923 K and high-temperature rhombohedral modification at 1084–1317 K. The thermal expansion property of a low-temperature solid solution was studied in the temperature range of 143–473 K. The samples of solid solution expand isotropically. As the content of phosphorus in the solid solution increases, the coefficients of linear thermal expansion are raised.
- Subjects
SOLID solutions; THERMAL expansion; EXPANSION of solids; PHASE transitions; MICROPROBE analysis; GARNET
- Publication
Journal of Thermal Analysis & Calorimetry, 2023, Vol 148, Issue 21, p11569
- ISSN
1388-6150
- Publication type
Article
- DOI
10.1007/s10973-023-12514-5