Synthesis and Stabilization of Crystal Hydrate Modification SrSO4⋅0.5H2O

A method has been developed for the synthesis of the metastable trigonal modification SrSO 4 ⋅0.5H 2 O, isostructural to the well-known CaSO 4 ⋅0.5H 2 O modification (space group P 3 1 21). Frozen solutions of NaCl in water have been proposed as a precursor in the crystallization of SrSO 4 ⋅0.5H 2 O...

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Bibliographic Details
Published in:Russian journal of inorganic chemistry 2023-04, Vol.68 (4), p.396-403
Main Authors: Bushuev, N. N., Sysoev, A. A., Velikodny, Yu. A.
Format: Article
Language:English
Subjects:
Calcium ions
Chemistry
Chemistry and Materials Science
Crystallization
Inorganic Chemistry
Lanthanum
Parameter modification
Potassium
Strontium
Strontium compounds
Strontium sulfate
Substitutes
Synthesis
Synthesis and Properties of Inorganic Compounds
Unit cell
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Summary:A method has been developed for the synthesis of the metastable trigonal modification SrSO 4 ⋅0.5H 2 O, isostructural to the well-known CaSO 4 ⋅0.5H 2 O modification (space group P 3 1 21). Frozen solutions of NaCl in water have been proposed as a precursor in the crystallization of SrSO 4 ⋅0.5H 2 O. The SrSO 4 ⋅0.5H 2 O structure can be stabilized by isovalent substitution of calcium ions for strontium ions or by aliovalent substitution of potassium and lanthanum ions for strontium ions. The compound of composition K 0.25 La 0.25 Sr 0.5 (SO 4 )⋅0.5H 2 O has been synthesized as an example of the stabilized SrSO 4 ⋅0.5H 2 O modification. The unit cell parameters have been determined and refined. A model of the structure of SrSO 4 ⋅0.5H 2 O with a statistical distribution of potassium, lanthanum, and strontium atoms over the positions of Ca atoms in the well-known СаSO 4 ⋅0.5H 2 O structure has been proposed.
ISSN:0036-0236
1531-8613
DOI:10.1134/S0036023622602628