V V Patil
Articles written in Bulletin of Materials Science
Volume 12 Issue 1 March 1989 pp 57-62
Pyroelectric properties of Gd-doped and undoped potassium vanadate and lithium vanadate investigated in the temperature range covering their transition points show sharp increase at Curie temperature for undoped and for 0·025, 0·05, 0·1 mol% Gd2O3-doped, but no remarkable peak at Curie temperature for 0·5, 1, 3 mol% Gd2O3-doped KVO3 and LiVO3. The Curie temperature of all the samples remains the same for various concentrations of Gd.
Volume 12 Issue 2 July 1989 pp 101-106
The d.c. electrical conductivity of sodium vanadate, rubidium vanadate, cesium vanadate and their solid solutions sodium-rubidium vanadate and sodium-cesium vanadate were studied by a two-probe method in the temperature range covering their transition points. The electrical conductivity shows sharp change at the phase transition temperature of these materials. In NaVO3, RbVO3 and CsVO3, increase in d.c. conductivity is observed in the ferroelectric region while nonlinearities are observed above transition temperatures. In solid solutions, the activation energy in the paraelectric state is higher than that in the ferroelectric state and depends upon sodium concentration.
Volume 12 Issue 2 July 1989 pp 133-136
The dielectric hysteresis property of sodium vanadate, rubidium vanadate, cesium vanadate and their solid solutions has been studied in the temperature range covering their transition points. The hysteresis loop method is used for coercive field measurements. It was observed that the coercive field decreases with increasing temperature, and that it also decreases with increasing sodium concentration in the solid solutions (sodium-rubidium) vanadate and (sodium-cesium) vanadate.
Volume 12 Issue 5 December 1989 pp 461-464
The dielectric hysteresis property of undoped and Gd2O3-doped potassium vanadate and lithium vanadate has been investigated in the temperature range covering their transition points. The hysteresis loop method has been used for coercive field measurements. The coercive field of Gd2O3-doped KVO3 and LiVO3 increases for 0·025, 0·05, and 0·1 mol %, however, it decreases for 0·5, 1 and 3 mol % of Gd2O3. It was found that the Curie temperatures of KVO3 and LiVO3 remain the same for various concentrations of Gd2O3.
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