Dielectric investigation of magnesium salt of 12-tungstophosphoric acid hydrate

• Published in: Solid state ionics 1999-10, Vol.125 (1-4), p.411-415
• Main Authors: DAVIDOVIC, M, CAJKOVSKI, T, CAJKOVSKI, D, LIKAR-SMILJANIC, V, BILJIC, R, MIOC, U, NEDIC, Z
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Diffusion in solids; Exact sciences and technology; Heteropolyacid salts; Permittivity (dielectric function); Permittivity measurements; Physics; Protonic conductivity; Self-diffusion and ionic conduction in nonmetals; Transport properties of condensed matter (nonelectronic)
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/S0167-2738(99)00203-9

Magnesium salt of 12-tungstophosphoric acid (WPA) hydrate MgHPW12O40–14H2O has been investigated in the microwave (X-band) and in the lower frequency (5 Hz–500 kHz) region. The specimens were obtained by pressing powder. Real and imaginary parts of permittivity were obtained for the specimens in both frequency regions. In the microwave region dipolar relaxation was observed with the relaxation time τ=1.6×10−11 s. This relaxation is attributed to the fast reorientation of H2O molecules. In the lower frequency region ionic jump relaxation was observed with the relaxation time τ=3.9×10−7 s. Results on ac and dc conductivity are discussed.