Crystallization Pathways of Cerium(IV) Phosphates Under Hydrothermal Conditions: A Search for New Phases with a Tunnel Structure

Hydrothermal crystallization pathways of amorphous ceric phosphate gels were found to be determined by the ammonia concentration in a reaction medium. This allows for highly selective hydrothermal synthesis of various finely crystalline ceric phosphates, including Ce(PO4)(HPO4)0.5(H2O)0.5, (NH4)2Ce(...

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Bibliographic Details
Published in:	European journal of inorganic chemistry Vol. 2019; no. 27; pp. 3242 - 3248
Main Authors:	Shekunova, Taisiya O., Istomin, Sergey Ya, Mironov, Andrey V., Baranchikov, Alexander E., Yapryntsev, Alexey D., Galstyan, Arsen A., Simonenko, Nikolay P., Gippius, Andrey A., Zhurenko, Sergey V., Shatalova, Tatyana B., Skogareva, Lyudmila S., Ivanov, Vladimir K.
Format:	Journal Article
Language:	English
Published:	Weinheim Wiley Subscription Services, Inc 23-07-2019
Subjects:	Ammonia Cerium Crystal structure Crystallization Gels Hydrothermal crystal growth Hydrothermal synthesis Inorganic chemistry Phosphates Synthesis design Thorium
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Summary:	Hydrothermal crystallization pathways of amorphous ceric phosphate gels were found to be determined by the ammonia concentration in a reaction medium. This allows for highly selective hydrothermal synthesis of various finely crystalline ceric phosphates, including Ce(PO4)(HPO4)0.5(H2O)0.5, (NH4)2Ce(PO4)2(H2O), and previously unknown NH4Ce2(PO4)3. The structure of the latter compound was solved from powder X‐ray diffraction data. It appeared to be isostructural to ammonium thorium phosphate, NH4Th2(PO4)3; in this crystal structure, large channels (5.07 × 3.79 Å) located along the c‐axis are occupied by NH4+ ions. A selective hydrothermal synthesis was proposed for crystalline ceric phosphates Ce(PO4)(HPO4)0.5(H2O)0.5, (NH4)2Ce(PO4)2(H2O), and previously unknown NH4Ce2(PO4)3.
ISSN:	1434-1948 1099-0682
DOI:	10.1002/ejic.201801182