On the Chemical Stability of CeIV(PO4)(HPO4)0.5(H2O)0.5 in Alkaline Media

被引：6

作者：

Kozlova, T. O. ^{[1
]}

Vasil'eva, D. N. ^{[1
,2
]}

Kozlov, D. A. ^{[1
]}

Teplonogova, M. A. ^{[1
,3
]}

Birichevskaya, K. V. ^{[1
]}

Baranchikov, A. E. ^{[1
]}

Gavrikov, A. V. ^{[1
]}

Ivanov, V. K. ^{[1
]}

机构：

[1] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Moscow 119991, Russia

[2] Natl Res Univ, Higher Sch Econ, Moscow 109028, Russia

[3] Moscow MV Lomonosov State Univ, Moscow 119991, Russia

来源：

RUSSIAN JOURNAL OF INORGANIC CHEMISTRY | 2022年 / 67卷 / 12期

关键词：

phosphates; REE; cerium; sodium hydroxide; THORIUM PHOSPHATE; CERIUM(IV) PHOSPHATE; CRYSTAL-STRUCTURE; HYDROTHERMAL SYNTHESIS; STRUCTURAL CHEMISTRY; SOLUBILITY; HYDROGENPHOSPHATE; ORTHOPHOSPHATES; MONAZITE; CEO2;

D O I：

10.1134/S0036023622601271

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Reaction of cerium(IV) orthophosphate-hydrogen orthophosphate Ce(PO4)(HPO4)(0.5)(H2O)(0.5) with aqueous solution of sodium hydroxide has been analyzed. It has been shown that the keeping of compound Ce(PO4)(HPO4)(0.5)(H2O)(0.5) in strongly alkaline solution at ambient temperature for 3 days leads to complete degradation of its structure to form X-ray amorphous phase with monazite admixture. According to IR spectroscopy, the reaction of Ce(PO4)(HPO4)(0.5)(H2O)(0.5) with NaOH over first day leads to deprotonation of hydrogen phosphate group and formation of Ce-O-Ce bonds. In alkaline medium, Ce(PO4)(HPO4)(0.5)(H2O)(0.5) phase shows no cation-exchange properties toward sodium ions. Thermal treatment of the products of alkaline hydrolysis of cerium(IV) orthophosphate-hydrogen orthophosphate allows preparation of composite material consisted of well crystallized CeO2 and CePO4 particles, the content of CeO2 in the resultant material may vary from 55 to 92 mol % depending on synthesis conditions.

引用

页码：1901 / 1907

页数：7

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