Conductivity and spectroscopic studies of Li2O-V2O5-B2O3 glasses

• Published in: Ionics Vol. 24; no. 7; pp. 1929 - 1938
• Main Authors: Saetova, N. S., Raskovalov, A. A., Antonov, B. D., Yaroslavtseva, T. V., Reznitskikh, O. G., Zabolotskaya, E. V., Kadyrova, N. I., Telyatnikova, A. A.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.07.2018; Springer Nature B.V
• Subjects: Boron oxides; Chemistry; Chemistry and Materials Science; Composition; Condensed Matter Physics; Conductivity; Electrical resistivity; Electrochemistry; Energy Storage; Fourier transforms; Lithium oxides; Optical and Electronic Materials; Original Paper; Renewable and Green Energy; Thermal stability; Vanadium oxides; Vanadium pentoxide; vanadate glasses; EPR spectroscopy; Electrical conductivity
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-018-2452-3

Lithium vanadium-borate glasses with the composition of 0.3Li 2 O–(0.7- x )B 2 O 3 – x V 2 O 5 ( x  = 0.3, 0.325, 0.35, 0.375, 0.4, 0.425, 0.45, and 0.475) were prepared by melt-quenching method. According to differential scanning calorimetry data, vanadium oxide acts as both glass former and glass modifier, since the thermal stability of glasses decreases with an increase in V 2 O 5 concentration. Fourier transform infrared spectroscopy data show that the vibrations of [VO 4 ] structural units occur at V 2 O 5 concentration of 45 mol%. It is established that the concentration of V 4+ ions increases exponentially with the growth of vanadium oxide concentration. Direct and alternative current measurements are carried out to estimate the contribution both electronic and ionic conductivities to the value of total conductivity. It is shown that the electronic conductivity is predominant in the total one. The glass having the composition of 0.3Li 2 O-0.275B 2 O 3 -0.475V 2 O 5 shows the highest electrical conductivity that has the value of 7.4 × 10 −5  S cm −1 at room temperature.