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Title: Production of complex rubidium and cesium hydrogen sulfate‒phosphates

Abstract

The solubility in the CsH{sub 2}PO{sub 4}‒CsHSO{sub 4}‒H{sub 2}O system at different temperatures (25, 50, and 75°C) is studied and the phase equilibria in the Rb{sub 3}H(SO{sub 4}){sub 2}‒RbH{sub 2}PO{sub 4}‒H{sub 2}O system under isothermal conditions (at 25°C) are analyzed. The temperature and concentration conditions for forming Rb{sub 2}(HSO{sub 4})(H{sub 2}PO{sub 4}), Rb{sub 4}(HSO{sub 4}){sub 3}(H{sub 2}PO{sub 4}), Cs{sub 4}(HSO{sub 4}){sub 3}(H{sub 2}PO{sub 4}), Cs{sub 3}(HSO{sub 4}){sub 2}(H{sub 2}PO{sub 4}), Cs{sub 2}(HSO{sub 4})(H{sub 2}PO{sub 4}), and Cs{sub 6}H(HSO{sub 4}){sub 3}(H{sub 2}PO{sub 4}){sub 4} compounds (the latter has been obtained for the first time) are determined. The conditions for growing large single crystals of complex acid rubidium and cesium salts are found.

Authors:
; ; ;  [1];  [2]
  1. Russian Academy of Sciences, Shubnikov Institute of Crystallography (Russian Federation)
  2. Lobachevsky State University of Nizhny Novgorod (Russian Federation)
Publication Date:
OSTI Identifier:
22645431
Resource Type:
Journal Article
Resource Relation:
Journal Name: Crystallography Reports; Journal Volume: 61; Journal Issue: 4; Other Information: Copyright (c) 2016 Pleiades Publishing, Inc.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CARBON SULFIDES; CESIUM PHOSPHATES; CRYSTAL GROWTH; HYDROGEN PHOSPHATES; HYDROGEN SULFATES; MONOCRYSTALS; RUBIDIUM PHOSPHATES; RUBIDIUM SULFATES

Citation Formats

Komornikov, V. A., E-mail: v.a.kom@mail.ru, Grebenev, V. V., Makarova, I. P., Selezneva, E. V., and Andreev, P. V. Production of complex rubidium and cesium hydrogen sulfate‒phosphates. United States: N. p., 2016. Web. doi:10.1134/S1063774516040106.
Komornikov, V. A., E-mail: v.a.kom@mail.ru, Grebenev, V. V., Makarova, I. P., Selezneva, E. V., & Andreev, P. V. Production of complex rubidium and cesium hydrogen sulfate‒phosphates. United States. doi:10.1134/S1063774516040106.
Komornikov, V. A., E-mail: v.a.kom@mail.ru, Grebenev, V. V., Makarova, I. P., Selezneva, E. V., and Andreev, P. V. 2016. "Production of complex rubidium and cesium hydrogen sulfate‒phosphates". United States. doi:10.1134/S1063774516040106.
@article{osti_22645431,
title = {Production of complex rubidium and cesium hydrogen sulfate‒phosphates},
author = {Komornikov, V. A., E-mail: v.a.kom@mail.ru and Grebenev, V. V. and Makarova, I. P. and Selezneva, E. V. and Andreev, P. V.},
abstractNote = {The solubility in the CsH{sub 2}PO{sub 4}‒CsHSO{sub 4}‒H{sub 2}O system at different temperatures (25, 50, and 75°C) is studied and the phase equilibria in the Rb{sub 3}H(SO{sub 4}){sub 2}‒RbH{sub 2}PO{sub 4}‒H{sub 2}O system under isothermal conditions (at 25°C) are analyzed. The temperature and concentration conditions for forming Rb{sub 2}(HSO{sub 4})(H{sub 2}PO{sub 4}), Rb{sub 4}(HSO{sub 4}){sub 3}(H{sub 2}PO{sub 4}), Cs{sub 4}(HSO{sub 4}){sub 3}(H{sub 2}PO{sub 4}), Cs{sub 3}(HSO{sub 4}){sub 2}(H{sub 2}PO{sub 4}), Cs{sub 2}(HSO{sub 4})(H{sub 2}PO{sub 4}), and Cs{sub 6}H(HSO{sub 4}){sub 3}(H{sub 2}PO{sub 4}){sub 4} compounds (the latter has been obtained for the first time) are determined. The conditions for growing large single crystals of complex acid rubidium and cesium salts are found.},
doi = {10.1134/S1063774516040106},
journal = {Crystallography Reports},
number = 4,
volume = 61,
place = {United States},
year = 2016,
month = 7
}
  • The distribution of rubidium and cesium in two-phase systems consisting of a chloride melt and a zirconium phosphate M( /SUP I/ ) Zr/sub 2/ (PO/sub 4/) /sub 3/ has been studied at 600-850/sup 0/C. It has been shown that the passage of rubidium from the liquid phase into the solid phase takes place and that the relative content of rubidium in the solid phase depends on its concentration in the melt (x-ray diffraction analysis). The distribution coefficients of rubidium and cesium between the melt and solid phosphates and arsenates have been determined by radiochemical analysis with the use of themore » /sup 87/Rb and /sup 137/Cs isotopes. Enrichment of the solid phase by the microconstituent has been established. The dependence of the distribution coefficients on the concentration of the distributed component, the composition of the melt, the nature of the solid phase, and the temperature has been established.« less
  • This article examines the possibility of the existence of ternary phosphates of the rare earth elements (REE) containing two large alkali cations in order to establish the morphological and physicochemical characteristics in the entire group of ternary REE phosphates. The synthesis of the ternary rubidium-cesium-REE phosphates was carried out with molten charges that did not contain an excess of components. Analysis for the uncommon alkali cations was done by the atomic absorption technique; for holmium, by complexometric titration; and for phosphorus, by gravimetry as NH/sub 4/CdPO/sub 4/. The data obtained fully confirm the composition of Rb/sub 2/CsLn(PO/sub 4/)/sub 2/.
  • Solubilities of RbNO/sub 3/ and CsNO/sub 3/ were examined as well as the nature of the solid phases in equilibrium with these systems in order to study the possible role of cation size. The formation of hydroperoxidates and the increase in solibility of the salts with larger cations in hydrogen peroxide- rich solutions indicate preferential solvation of the ions by H/sub 2/O/sub 2/ rather than by H/sub 2/O. Conversely, the formation of hydrates and lower solubility in hydrogen peroxide-rich solutions of the smaller cation salts indicate preferential solvation of the ions by water. The deviation of the molal solubility, M',more » of the alkali nitrates in H/sub 2/O/sub 2/ from that in H/sub 2/O (M/sub H /sub 2/O/sub 2/) at ' =33.5r - 39.7 ( plus or minus 0.03 in M'), where r is the radius of the cation. CsNO/sub 3/, however, did not fall on the line, which probably is due to the lower charge density of the cesium ion. (P.C.H.)« less