Synthesis of the fibrous materials rho-Na0.50H0.50TiOPO4 and rho-K0.67H0.33TiOPO4 by reaction of rho-Ti2O(PO4)(2)(H2O)(2) with molten alkali nitrates

Authors
Espina, A Trobajo, C Khainakov, SA Garcia, JR
Citation
A. Espina et al., Synthesis of the fibrous materials rho-Na0.50H0.50TiOPO4 and rho-K0.67H0.33TiOPO4 by reaction of rho-Ti2O(PO4)(2)(H2O)(2) with molten alkali nitrates, MATER RES B, 36(13-14), 2001, pp. 2531-2541
Citations number
25
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS RESEARCH BULLETIN
ISSN journal
00255408 → ACNP
Volume
36
Issue
13-14
Year of publication
2001
Pages
2531 - 2541
Database
ISI
SICI code
0025-5408(20011101)36:13-14<2531:SOTFMR>2.0.ZU;2-Y
Abstract
The reaction of rho -TiP with molten MNO3 (M = Na, K) originates the format ion of new metal phases, rho -MxH1-xTiOPO4 (x = 0.50, M = Na; x = 0.67, M = K). These compounds maintain the fibrous morphology of their precursors. T he processes occur in two differentiated steps with formation of rho -MxH1- xTiOPO4 (x = 0.25, M = Na; x = 0.42, M = K) intermediate phases. An ion-exc hange mechanism is proposed for the reaction. Thermal treatment of the nove l fibrous alkali metal phosphates produces mixtures of MTiOPO4, MTi2(PO4)(3 ), and TiO2. (C) 2001 Elsevier Science Ltd. All rights reserved.