Articles written in Bulletin of Materials Science
Volume 17 Issue 6 November 1994 pp 951-958
The ferroelectric Bi4SrTi4O15 has been synthesized and a study of the electrical (AC) conductivity was made on both poled and unpoled samples in the frequency range from 100 Hz to 1 MHz and from room temperature to 550°C. In the case of unpoled samples the activation energy was found to be 0·54 eV and subsequent to poling it was lowered to 0·39 eV indicating an increased conductivity after poling. Further the conductivity increased with increasing frequency and temperature. DC conductivity measurements were also carried out. Dielectric measurements indicate a peak in the dielectric constant at 530°C.
Volume 18 Issue 1 February 1995 pp 93-97 Seminar On “Recent Trends In Glass And Glass-Ceramics Research”
Ceramic samples of Li0·1Ba0·95(V
Volume 19 Issue 4 August 1996 pp 639-643
Volume 21 Issue 3 June 1998 pp 251-255
An experimental setup is developed for the measurement of dynamic magnetoelectric effect (ME) in polycrystalline materials, using a time varying DC magnetic field on which an AC magnetic field is superimposed. The experimental data on ME on Bi5FeTi3O15 and a solid solution of (90%)BiFeO3-(10%)BaTiO3 are obtained using this setup. The linear and higher order ME coefficients can be evaluated from the output voltage. The temperature variation of ME data gives additional information corroborating with the data on magnetization.
Volume 22 Issue 1 February 1999 pp 59-64 Electrical Properties
Pyroelectric properties of bismuth layer structured calcium substituted sodium bismuth titanate (Na0·5Bi0·5)1−
Volume 22 Issue 4 June 1999 pp 779-783 Electrical Properties
Impedance of sintered discs of 0·1, 0·25, 0·4 mol% of sodium metavanadate was measured in the frequency range 10 kHz-1 MHz and in the temperature region from room temperature (=30°C) to 450°C. AC conductivity was calculated from the data. DC conductivity was measured in the temperature range 150–450°C. Debye type of relaxation effects were observed in the dielectric loss. The activation energy of the dipoles involved in relaxation was estimated. The activation energy for AC conduction in the temperature above 380°C was calculated. These values are larger than the activation energy of pure sodium metavanadate sample. The relaxation phenomenon observed is explained.
Volume 42 | Issue 6
Click here for Editorial Note on CAP Mode