Naslov
Electrical properties of Li2O-ZnO-P2O5 glasses

Autori
Moguš-Milanković, Andrea ; Pavić, Luka ; Reis, T., Signo ; Day, E., Delbert

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Charge transport P89, 5th Conference on Broadband Dielectric Spectroscopy and its Applications / Gisele Boiteux - Lyon, 2008

Skup
5th International Conference on Broadband Dielectric Spectroscopy and its Applications

Mjesto i datum
Lyon, Francuska, 26.08.2008. - 29.08.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Electrical conductivity; Lithium phosphate glass

Sažetak
Lithium zinc phosphate glasses of the composition xLi2O-(40-x)ZnO-60 P2O5 (0<x<40), mol% were prepared by melting and analyzed by different thermal analysis (DTA), Raman and Impedance spectroscopy in the frequency range from 0.01 Hz to 4 MHz and temperature range from 303 to 473 K. The systematic change in the variety of properties, such as glass transition temperature, Tg, and density at 20 mol% Li2O is explained by changes in the nature of the oxygen bonds in glass network. The Raman spectra predominantly show the metaphosphate structure with barely detectable pyrophosphate units for all glasses in the series. However, replacing ZnO with Li2O in these glasses leads to the compositional dependent changes. This dependence is explained by different structural cross-linking of phosphate chains with increasing Li2O, which is correlated with the unusual Tg minimum at 20 mol% Li2O. The electrical conductivity as a function of Li2O concentration measured at lower temperatures (298 and 333 K) passes thought a minimum at 20 mol% whereas linearly increases at higher temperatures. This suggests that the conductivity enhancement is directly related to the thermally stimulated mobility of Li+ ions in the high temperature region. The observed minimum in electrical conductivity at 20 mol% Li2O is related to the structural reorganization of the glass network. With increasing Li2O content up to 40 mol% the values of electrical conductivity increases for five orders of magnitude indicating the ionic conductivity.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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