Synthesis, Structure, and Thermal Expansion of Triple Phosphates of Potassium–Strontium–Rare Earth Elements

Polycrystalline phases of variable composition K x Sr 12 – 2 x R 4 + x (PO 4 ) 12 (R = Nd, Eu, and Gd; 0 ≤  x  ≤ 4) with the structure of the mineral eulytite (space group I 3 d ) have been synthesized by evaporation of the salt solution followed by heat treatment. Their structures have been studied...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2021-06, Vol.66 (6), p.799-805
Main Authors: Pet’kov, V. I., Bokov, A. I., Asabina, E. A., Borovikova, E. Y.
Format: Article
Language:English
Subjects:
Apexes
Chemistry
Chemistry and Materials Science
Electron probes
Gadolinium
Heat treatment
Infrared spectroscopy
Inorganic Chemistry
Phosphates
Rare earth elements
Saline solutions
Synthesis and Properties of Inorganic Compounds
Tetrahedra
Thermal expansion
X ray powder diffraction
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Summary:Polycrystalline phases of variable composition K x Sr 12 – 2 x R 4 + x (PO 4 ) 12 (R = Nd, Eu, and Gd; 0 ≤  x  ≤ 4) with the structure of the mineral eulytite (space group I 3 d ) have been synthesized by evaporation of the salt solution followed by heat treatment. Their structures have been studied by X-ray powder diffraction and IR spectroscopy, and electron probe studies have been carried out. The structure of KSr 10 Eu 5 (PO 4 ) 12 has been refined; it has been found that the neutral framework is formed by edge-linked metal-oxygen octahedra (K,Sr,Eu)O 6 with PO 4 tetrahedra located between them and attached to the octahedra by oxygen vertices. At temperature change, phosphates expand uniformly in all directions: α а = α b = α c = (9−12) × 10 −6 K −1 without undergoing polymorphic transitions.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023621060152