Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate
Nema prikaza
Autori
Davidović, Miloš D.Cajkovski, T
Cajkovski, D
Likar-Smiljanic, V
Biljic, R
Mioč, Ubavka B.
Nedić, Zoran
Članak u časopisu
Metapodaci
Prikaz svih podataka o dokumentuApstrakt
Barium salt of 12-tungstophosphoric acid (WPA) hydrate BaHPW12O40.7H(2)O (BaHWPA-7H20) has been investigated both in the microwave (X-band) region and in the lower frequency (5 Hz-500 kHz) region. This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrate salts. The real and imaginary parts of the permittivity (epsilon, epsilon) as a function of frequency and temperature, were determined in both frequency regions. The observed relaxations were attributed to specific relaxation processes. In the lower frequency range, the relaxation time tau=1.0 x 10(-6) s was assigned to barium ion jumps. In the microwave region, the dielectric relaxation time tau =1.7 x 10(-11) s was attributed to polyatomic ions (H3O+) and/or H2O molecules reorientations. A phase transition was observed at 330 K. The low value of the activation energy for reorientation in the microwave frequency region is discussed. The d....c. conductivity and its temperature dependence were determined. Measurements were made in the temperature interval from 286 to 353 K. In the upper part of this temperature interval a PTCR effect was observed. (C) 2002 Published by Elsevier Science B.V.
Ključne reči:
heteropolyacid salts / protonic conductivity / permittivity measurementsIzvor:
Solid State Ionics, 2002, 147, 1-2, 123-128
DOI: 10.1016/S0167-2738(02)00003-6
ISSN: 0167-2738
WoS: 000174861900013
Scopus: 2-s2.0-0036499446
Kolekcije
Institucija/grupa
VinčaTY - JOUR AU - Davidović, Miloš D. AU - Cajkovski, T AU - Cajkovski, D AU - Likar-Smiljanic, V AU - Biljic, R AU - Mioč, Ubavka B. AU - Nedić, Zoran PY - 2002 UR - https://vinar.vin.bg.ac.rs/handle/123456789/2509 AB - Barium salt of 12-tungstophosphoric acid (WPA) hydrate BaHPW12O40.7H(2)O (BaHWPA-7H20) has been investigated both in the microwave (X-band) region and in the lower frequency (5 Hz-500 kHz) region. This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrate salts. The real and imaginary parts of the permittivity (epsilon, epsilon) as a function of frequency and temperature, were determined in both frequency regions. The observed relaxations were attributed to specific relaxation processes. In the lower frequency range, the relaxation time tau=1.0 x 10(-6) s was assigned to barium ion jumps. In the microwave region, the dielectric relaxation time tau =1.7 x 10(-11) s was attributed to polyatomic ions (H3O+) and/or H2O molecules reorientations. A phase transition was observed at 330 K. The low value of the activation energy for reorientation in the microwave frequency region is discussed. The d.c. conductivity and its temperature dependence were determined. Measurements were made in the temperature interval from 286 to 353 K. In the upper part of this temperature interval a PTCR effect was observed. (C) 2002 Published by Elsevier Science B.V. T2 - Solid State Ionics T1 - Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate VL - 147 IS - 1-2 SP - 123 EP - 128 DO - 10.1016/S0167-2738(02)00003-6 ER -
@article{ author = "Davidović, Miloš D. and Cajkovski, T and Cajkovski, D and Likar-Smiljanic, V and Biljic, R and Mioč, Ubavka B. and Nedić, Zoran", year = "2002", abstract = "Barium salt of 12-tungstophosphoric acid (WPA) hydrate BaHPW12O40.7H(2)O (BaHWPA-7H20) has been investigated both in the microwave (X-band) region and in the lower frequency (5 Hz-500 kHz) region. This work is a continuation of our previous investigations on the influence of monovalent and bivalent cations on the dielectric properties of WPA hydrate salts. The real and imaginary parts of the permittivity (epsilon, epsilon) as a function of frequency and temperature, were determined in both frequency regions. The observed relaxations were attributed to specific relaxation processes. In the lower frequency range, the relaxation time tau=1.0 x 10(-6) s was assigned to barium ion jumps. In the microwave region, the dielectric relaxation time tau =1.7 x 10(-11) s was attributed to polyatomic ions (H3O+) and/or H2O molecules reorientations. A phase transition was observed at 330 K. The low value of the activation energy for reorientation in the microwave frequency region is discussed. The d.c. conductivity and its temperature dependence were determined. Measurements were made in the temperature interval from 286 to 353 K. In the upper part of this temperature interval a PTCR effect was observed. (C) 2002 Published by Elsevier Science B.V.", journal = "Solid State Ionics", title = "Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate", volume = "147", number = "1-2", pages = "123-128", doi = "10.1016/S0167-2738(02)00003-6" }
Davidović, M. D., Cajkovski, T., Cajkovski, D., Likar-Smiljanic, V., Biljic, R., Mioč, U. B.,& Nedić, Z.. (2002). Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate. in Solid State Ionics, 147(1-2), 123-128. https://doi.org/10.1016/S0167-2738(02)00003-6
Davidović MD, Cajkovski T, Cajkovski D, Likar-Smiljanic V, Biljic R, Mioč UB, Nedić Z. Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate. in Solid State Ionics. 2002;147(1-2):123-128. doi:10.1016/S0167-2738(02)00003-6 .
Davidović, Miloš D., Cajkovski, T, Cajkovski, D, Likar-Smiljanic, V, Biljic, R, Mioč, Ubavka B., Nedić, Zoran, "Dielectric relaxation and conductivity in barium salt of 12-tungstophosphoric acid hydrate" in Solid State Ionics, 147, no. 1-2 (2002):123-128, https://doi.org/10.1016/S0167-2738(02)00003-6 . .