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8. Structure and proton conductivity in a magnesium salt of 12-tungstophosphoric acid

Author

Mioč, U.B., Todorović, M.R., Uskoković-Marković, S.M., Davidović, M., Kremenović, A., Spasojevic - De Biré, Anne, Čajkovski, T., Likar-Smiljanić, V., Biljić, R., Faculty of Physical Chemistry, University of Belgrade [Belgrade], Faculty of Chemistry, Faculty of Pharmacy, Vinča Institute of Nuclear Sciences, Laboratoire Structures, Propriétés et Modélisation des solides (SPMS), Institut de Chimie du CNRS (INC)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Department of Crystallography [University of Belgrade], Faculty of mining and geology, University of Belgrade [Belgrade]-University of Belgrade [Belgrade], Faculty (School) of Electrical Engineering, VTA Žarkovo, and Ministry of Science and Technology of the People's Republic of China 1730

Subjects
Permittivity, Scanning electron microscope, Inorganic chemistry, Salt (chemistry), Infrared spectroscopy, 02 engineering and technology, Dielectric, Crystal structure, Conductivity, 010402 general chemistry, 01 natural sciences, [SPI.MAT]Engineering Sciences [physics]/Materials, protonic conductivity, Protonic conductivity, General Materials Science, structure, Thermal analysis, chemistry.chemical_classification, Structure, General Chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 0104 chemical sciences, chemistry, dielectric properties, Dielectric properties, 0210 nano-technology
Abstract

Some structural properties of a magnesium salt of 12-tungstophosphoric acid, MgHPW12O40.nH(2)O (MgHVvTA-n), are reported. The influence of the Mg2+ ion on the structure, dynamics of the protonic species, and dielectric and conductive characteristics of the salt have been studied. The interaction of protonic species with Keggin anion was discussed. Preliminary results of the crystal structure indicate that the structure is composed of Keggin anions and Mg(OH2)(6) aqua-complexes. Some comparisons are made with other alkaline-earth and alkaline salts of WPA. The results of thermal analysis (TGA and DTA), X-ray diffraction (XRD), scanning electron microscopy (SEM), infrared spectroscopy (IR), conductivity and permittivity measurements of MgHWPA-n are reported and discussed. (C) 2003 Elsevier B.V. All rights reserved. 11th International Conference on Solid State Protonic Conductors (SSPC 11), Aug 27-30, 2002, Univ Surrey, Guildford, England

Published
2003
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