Sodium Chromium Arsenate Phosphates: Preparation, Structure, and Thermal Properties

Arsenate phosphates (1.75 ≤ x ≤ 3.0) were prepared by coprecipitation. Their unit cell parameter was a linear function of composition: a (Å) = 0.0967 x + 11.873. The Na 3 Cr 2 (AsO 4 ) 2 PO 4 crystal structure was refined by the Rietveld method; the coordinates of basal atoms and bond lengths were c...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2023-10, Vol.68 (10), p.1371-1379
Main Authors: Pyaterikov, E. A., Pet’kov, V. I., Fukina, D. G., Borovikova, E. Yu
Format: Article
Language:English
Subjects:
Arsenates
Chemical bonds
Chemistry
Chemistry and Materials Science
Crystal structure
Garnets
Inorganic Chemistry
Linear functions
Low temperature
Mathematical analysis
Phosphates
Rietveld method
Solid solutions
Synthesis and Properties of Inorganic Compounds
Thermal expansion
Thermodynamic properties
Unit cell
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Summary:Arsenate phosphates (1.75 ≤ x ≤ 3.0) were prepared by coprecipitation. Their unit cell parameter was a linear function of composition: a (Å) = 0.0967 x + 11.873. The Na 3 Cr 2 (AsO 4 ) 2 PO 4 crystal structure was refined by the Rietveld method; the coordinates of basal atoms and bond lengths were calculated. A garnet solid solution crystallizes at 600–650°C; transition to a high−temperature rhombohedral structure occurred at 994–1044°C. The thermal expansion of the low-temperature phase having a garnet structure was studied in the range from –130 to 200°C. The solid solution samples expanded isotropically and had small thermal expansion.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023623601927