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19. 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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34. Characterization of Insoluble Monovalent K+, Tl+ and Ag+ Salts of 12-Tungstophosphoric Acid

Author

Todorović, M.R., Holclajtner-Antunović, I., Mioč, U.B., and Bajuk-Bogdanović, D.

Abstract

The K3PW12O40, K2.5H0.5PW12O40, K2HPW12O40, KH2PW12O40, Ag3PW12O40 and Tl3PW12O40 salts were synthesized and characterized by thermal analysis, IR and impedance spectroscopy, and SEM. The physicochemical characterization of acid alkaline salts revealed the presence of biphasic mixtures of unreacted heteropoly acid and its neutral salt. The unreacted heteroply acid could be washed away by treating the acid salt with water.

Published
2007
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35. Investigation of (PO4)/(WO6)3 - Lattice Components of Keggin`s Anion Interaction with Cations in Alkaline-Earth Salts of 12-Tungstophosphoric Acid

Author

Uskoković-Marković, S., Colomban, Philippe, Mioč, U.B., and Todorović, M.R.

Abstract

On the basis of previously recorded Raman and IR spectral data on different crystallohydrates of alkaline-earth 12-tungstophosphoric acid salts (obtained from mother solution and those kept under constant relative humidity (RH) of 35%), an effort was made to determine the position of cations in the Keggin unit. Shifts or band splitting in vibrational spectra of the salts, as well as the changes in band intensities were found to be connected to the cation properties. The spectral data also demonstrated a great influence of cation properties on the secondary structure of Keggin anions and dynamics of protonic species.

Published
2007
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