Effects of substituting B2O3 for P2O5 on the structures and properties of V2O5-P2O5 glass systems

Han, Kyungseok; Hwang, Chawon; Kim, Dong Hwan; Gwoo, Donggun; Kim, Tae-Hee; Choi, Won‐Gyu; Kee, Kyung-Bum; Kim, Jonghwan; Ryu, Bong Ki

doi:10.1007/s13391-012-2093-z

Cited by 14 publications

(2 citation statements)

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“…This result is an indication for the existence of common ac conduction or relaxation mechanism in all the glasses at all measured temperatures. Temperature independence of relaxation in the present glasses has been further checked by normalizing ac conductivity according to scaling formula [33], (6) As per Eqn. (6) (ζac/ζdc) versus (ω/ζdcT) for BPCL1 glass for different temperature are plotted in Fig.…”

Section: Conductivity Master Curvesmentioning

confidence: 99%

“…Such studies in pure borate and phosphate glasses have limitations due to their hygroscopic nature despite the fact they have low melting temperatures and can be easily prepared. However, addition of few boron atoms into phosphate glass network lead to enhanced chemical durability and improved thermal properties [3][4][5][6]. Ionic conduction in Ag2S doped silver phosphate glasses have been studied for frequencies up to 60 GHz and temperature up to 413K.…”

Section: Introductionmentioning

confidence: 99%

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DIELECTRIC STUDIES IN Li2O AND CoO DOPED BOROPHOSPHATE GLASSES

Talari

Ashwajeet

Ramanna

et al. 2015

JAP

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Borophosphate glasses in the compositions, (B2O3)0.2 . (P2O5)0.3 . (Li2O) 0.5-X . (CoO) X, wherex = 0.05, 0.1, 0.15, 0.25, 0.30, 0.35, 0.40 and 0.45 were prepared at 1400K by following melt quenching method. Their amorphous nature was confirmed by XRD studies and was investigated for dielectric properties in the frequency range from 100Hz to 1MHz and temperature range from 300K to 573K. The conductivity was derived from the dielectric spectrum. The frequency exponent, s, dc and ac components of the conductivity were determined. The temperature dependence of conductivity at different frequencies was analyzed using Mottâ€™s small polaron hopping model, and the high temperature activation energy has been estimated and discussed. The variation of conductivity and activation energy with composition revealed a changeover of conduction mechanism from predominantly ionic to electronic regime for mole fractions of CoO between 0.3 and 0.35. This is a new result. Huntâ€™s model has been employed to analyze frequency dependence of conductivity. Relaxation features of the dielectric properties have been extracted from the analysis of electric moduli with frequency. Activation energy for relaxation mechanism has been determined. Frequency exponent was found to be temperature dependent. Quantum mechanical theory and correlated barrier hopping models were found to be inadequate to explain frequency exponent behavior with temperature.For the first time that borophosphate glasses doped with Li2O and CoO were studied for dielectric properties and ac conductivity as a function of temperature and frequency and the data has been analysed thoroughly.Â

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Section: Conductivity Master Curvesmentioning

confidence: 99%