K J Rao
Articles written in Pramana – Journal of Physics
Volume 16 Issue 4 April 1981 pp 309-313 Chemical Physics
X-ray absorption edge and X-ray photoelectron spectroscopic studies of As-Se glasses seem to support a chemical ordering model.
Volume 19 Issue 2 August 1982 pp 125-131 Solid State Physics
AC conductivity and dielectric properties of sulphate glasses have been studied as a function of temperature, frequency and variation in interalkali concentration. AC conductivity at frequencies well beyond the dielectric loss peaks seems to arise from local motion of alkali ions within the neighbouring potential wells. Activation energies for AC conductivity were found to be very much lower than those for DC conductivity. Further, AC conductivity seems to be independent of interalkali variation, whereas ε′ and tan δ show a mild degree of mixed alkali effect. The observations made here have been explained on the basis of a structural model earlier proposed by us for these glasses.
Volume 32 Issue 6 June 1989 pp 811-820 Condensed Matter Physics
Silver iodide-based fast ion conducting glasses containing silver phosphate and silver borate have been studied. An attempt is made to identify the interaction between anions by studying the chemical shifts of31P and11B atoms in high resolution (HR) magic angle spinning (MAS) NMR spectra. Variation in the chemical shifts of31P or11B has been observed which is attributed to the change in the partial charge on the31P or11B. This is indicative of the change in the electronegativity of the anion matrix as a whole. This in turn is interpreted as due to significant interaction among anions. The significance of such interaction to the concept of structural unpinning of silver ions in fast ion conducting glasses is discussed.
Volume 43 Issue 3 September 1994 pp 189-192
The effect of pressure on the conductivity of AgI-Ag2O-MoO3 glasses has been reexamined. A conductivity maximum is observed around 0·7 GPa. No variation of the sample temperature is noted under pressure. The results are found to agree well with the cluster-tissue model.
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