Revisiting the Thermal Decomposition of Layered gamma-Titanium Phosphate and Structural Elucidation of Its Intermediate Phases
authors Garcia-Granda, S; Khainakov, SA; Espina, A; Garcia, JR; Castro, GR; Rocha, J; Mafra, L
nationality International
journal INORGANIC CHEMISTRY
keywords INORGANIC-ION EXCHANGERS; RAY-DIFFRACTION SPECTROMETRY; ZIRCONIUM PHOSPHATE; POWDER DIFFRACTION; CRYSTAL-STRUCTURE; ALPHA-ZIRCONIUM; RIETVELD REFINEMENT; SUPERSTRUCTURE; DEHYDRATION; TRANSITIONS
abstract The thermal transformations of gamma-titanium phosphate, Ti(PO4)(H2PO4)center dot 2H(2)O, have been studied by thermal analyses (thermogravimetry (TG) and differential thermal analysis (DTA)) and variable-temperature P-31 magic-angle spinning (MAS)/CPMAS and 2D P-31-P-31 spin-exchange NMR. The structure of this material has been refined from synchrotron powder X-ray diffraction data (monoclinic, P2(1), a=5.1811(2) angstrom, b=6.3479(2) angstrom, c=23.725(2) angstrom, beta = 102.57(1)degrees). Vyazovkin's model-free kinetic algorithms have been applied to determine the apparent activation energy to both dehydration and dehydroxylation of gamma-titanium phosphate. In these processes, several overlapped steps have been detected. Structural models for Ti(PO4)(H2PO4)center dot H2O and Ti(PO4)(H2P2O7)(0.5) intermediate layered phases have been proposed.
publisher AMER CHEMICAL SOC
issn 0020-1669
year published 2010
volume 49
issue 6
beginning page 2630
ending page 2638
digital object identifier (doi) 10.1021/ic901254j
web of science category Chemistry, Inorganic & Nuclear
subject category Chemistry
unique article identifier WOS:000275164900010
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