Transport properties of Li2O-​MnO2-​B2O3 glasses

Li borate contg. MnO2 glasses were synthesized by melt quenching technique over a wide compn. range. Frequency and temp. dependent cond. measurements were carried out in the range of 10 Hz to 13 MHz and at a temp. range of 298-​523 K, resp. The impedance plots show only one semicircle indicating the presence of one type of conduction mechanism. The anal. of d.c. cond. show that the cond. is dominated by Li+ ions and the presence of MnO2 has negligible effect. The a.c. cond. data was analyzed by fitting the data into Almond-​West type power law behavior σ = σ(o) + Aωs. The power law exponent s is also detd. and it is found to decrease with increase of temp. We have also carried out the scaling behavior of the a.c. cond. and it is seen that all the curves coalesce on to a master curve suggesting that the ion transport mechanism remains unaffected at all temps. The results are discussed in the light of the structure of borate glass network