Revisiting the Thermal Decomposition of Layered γ-Titanium Phosphate and Structural Elucidation of Its Intermediate Phases

被引：20

作者：

Garcia-Granda, Santiago ^{[3
,4
]}

Khainakov, Sergei A. ^{[3
,4
]}

Espina, Aranzazu ^{[3
,4
]}

Garcia, Jose R. ^{[3
,4
]}

Castro, German R. ^{[2
]}

Rocha, Joao ^{[1
]}

Mafra, Luis ^{[1
]}

机构：

[1] Univ Aveiro, Dept Chem, CICECO, P-3810193 Aveiro, Portugal

[2] ESRF, Spanish CRG Beamline, SpLine, F-38043 Grenoble, France

[3] Univ Oviedo, Dept Quim Fis & Analit, Oviedo 33006, Spain

[4] Univ Oviedo, Dept Quim Organ & Inorgan, E-33006 Oviedo, Spain

来源：

INORGANIC CHEMISTRY | 2010年 / 49卷 / 06期

关键词：

INORGANIC-ION EXCHANGERS; RAY-DIFFRACTION SPECTROMETRY; ZIRCONIUM PHOSPHATE; POWDER DIFFRACTION; CRYSTAL-STRUCTURE; ALPHA-ZIRCONIUM; RIETVELD REFINEMENT; SUPERSTRUCTURE; DEHYDRATION; TRANSITIONS;

D O I：

10.1021/ic901254j

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

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.

引用

页码：2630 / 2638

页数：9

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