Glass formation and electrical conductivity studies on the AgI-Ag2O-[xV2O5 + (1-x)P2O5], O ≤ x ≤ 1, have been carried out. Glass forming region is found to be within 40 and 66.7 m/o AgI. For similar mole fraction of AgI, quaternary glasses show higher conductivities than the individual ternary systems. Glass transition temperature is found to be almost independent of the V2O5/P2O5 ratio. © 1987.

Rajiv Kaushik

Krishnaswamy Hariharan

Electrolytes

Silver compounds

GLASS FORMER

Glass Transition Temperature

QUATERNARY GLASSES

SILVER PHOSPHOVANADATE

Ternary systems

VITREOUS ELECTROLYTES

Glass

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

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IIT Madras

Silver phosphovanadte vitreous electrolytes

Solid State Communications

Investigations on the glass system mol% 50Li2O:(50 - x)P2O5:xB2O3 reveal that the glass forming region is limited to a small region of 0 ≤ x ≤ 20. Addition of B2O3 is found to enhance the thermal stability of the glasses. Raman spectra reveal that the glass matrix undergoes structural modification for x ≥ 15, with the formation of borophosphate structural units, due to the presence of which, the glass composition 50Li2O: 30P2O5: 20B2O3 has exhibited dc conductivity value of 1.8 × 10- 5 S cm- 1, when compared to the value of 8.4 × 10- 7 S cm- 1 of 50Li2O: 50P2O5 at 110 °C. Though ball milled sample for x = 15 initially exhibited better conduction characteristics than melt quenched ones, the conductivity decreased during thermal cycling process probably due to the phase instability of the milled samples. The frequency dependent conductivity plots have been scaled to a single master curve indicating temperature independent relaxation mechanism. © 2007 Elsevier B.V. All rights reserved.

Solid State Ionics

Glass formation and electrical conductivity studies of melt quenched and mechanically milled 50Li2O:(50 - x) P2O5:xB2O3

Sodium borophosphate glasses of composition (mol%) 50Na2O- 50[xB2O3-(1-x)P2O5], 0 ≤ x ≤ 0.8 have been prepared by melt quenching method and characterized through XRD, DSC, FTIR and impedance spectroscopy techniques. The glass transition temperature increases with the substitution of B2O3 due to the cross-linking of the network and the FTIR study shows the presence of different structural units in the network. The ionic conductivity study as a function of composition of B2O3 shows increment in conductivity with two conductivity maxima at 10 and 30 mol% of B 2O3 and conductivity variations with temperature follow an Arrhenius type behaviour. Transport numbers evaluated for ions and electrons show that Na+ ions are the mobile species in the investigated systems. The frequency dependence of the electric conductivity follows a simple power law feature. The analysis of various electrical parameters as a function of temperature in different complex planes shows that the charge transport occurs by the hopping mechanism. © 2004 Elsevier B.V. All rights reserved.

Materials Chemistry and Physics

Structure and ionic transport studies of sodium borophosphate glassy system

Journal	Solid State Communications
ISSN	00381098
Open Access	No