EQUILIBRIUM OF THE PROTONIC SPECIES IN HYDRATES OF SOME HETEROPOLYACIDS AT ELEVATED-TEMPERATURES

被引：114

作者：

MIOC, U

DAVIDOVIC, M

TJAPKIN, N

COLOMBAN, P

NOVAK, A

机构：

[1] BORIS KIDRIC INST NUCL SCI,YU-11001 BELGRADE,YUGOSLAVIA

[2] ECOLE POLYTECH,LPMC,CHIM SOLIDE GRP,CNRS,URA 1254,F-91128 PALAISEAU,FRANCE

[3] LAB SPECTROCHIM INFRA ROUGE & RAMAN,CNRS,F-94320 THIAIS,FRANCE

来源：

SOLID STATE IONICS | 1991年 / 46卷 / 1-2期

关键词：

D O I：

10.1016/0167-2738(91)90136-Y

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Hydrates of three heteropolyacids: 12-molybdophosphoric H3PMo12O40.nH2O (MoPA.nH2O), 12-tungstophosphoric H3PW12O40.nH2O (WPA.nH2O) and 12-tungstosilicic acid H4SiW12O40.nH2O (WSiA.nH2O) were examined by using thermal analysis, infrared spectroscopy and impedance measurements. These compounds are known as superionic proton conductors and their behaviour was examined as a function of temperature. At the TGA and DSC curves, in the 300-500 K temperature range, transformations were observed at several temperatures. These transformations are partially due to the dehydration process and partially to the change of equilibrium of protonic species (H3O+, H2O and OH- and their possible association: H5O2+, H7O3+, ...), as shown by thermal analysis and infrared spectroscopy.

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页码：103 / 109

页数：7

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