Phase formation in the systems TiOCl2-H3PO4-MF(HF)-H2O (M = K, Rb, Cs)

Autor:	A. T. Belyaevskii, M. M. Godneva
Rok vydání:	2013
Předmět:	Materials science Annealing (metallurgy) Materials Science (miscellaneous) Inorganic chemistry chemistry.chemical_element Alkali metal Phase formation Ion Amorphous solid Inorganic Chemistry Bridging oxygen Crystallography chemistry Physical and Theoretical Chemistry Powder diffraction Titanium
Zdroj:	Russian Journal of Inorganic Chemistry. 58:1434-1442
ISSN:	1531-8613 0036-0236
Popis:	From solutions containing 2–17 wt % TiO2 at the molar ratios M/Ti = 1–4, F/Ti = 2–4, and PO43−/Ti = 0.5–10 under mild conditions, fluoro- and oxo(hydroxo) fluorophosphate titanates were isolated: crystalline M2TiF6 (M = K, Rb, Cs) and K2Ti2O2.5F2PO4 · 2H2O, and amorphous K3Ti4O(OH)F7(PO4)3 · 5H2O, Cs2Ti3O2F7PO4 · 6H2O, and CsTi3O3F4PO4 · 3H2O. In a mixture with M2TiF6 and KCl, phosphate-ion-containing crystalline phases of unidentified composition were detected. The phases were studied by elemental, crystal-optical, X-ray powder diffraction, thermal, IR spectroscopic, and electron microscopic analyses. Annealing fluorophosphate titanates gives a mixture of MTiOPO4 and TiO2. All the mentioned alkali metal fluorophosphates contain the tetrahedral ion PO43− and titanium polyhedra with bonds Ti-F and Ti-O; some of them also contain bridging oxygen connecting titanium atoms: Ti-O-Ti; i.e., these substances are polymeric.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5c78ad6a749d8f6c6d0e097e0a102a8a https://doi.org/10.1134/s0036023613120115 Zobrazit plný text záznamu Full text from SpringerLink