• B A Patki

      Articles written in Pramana – Journal of Physics

    • X-ray spectroscopic study of zirconium and molybdenum diselenides

      V G Bhide B A Patki

      More Details Abstract Fulltext PDF

      The K absorption spectra of zirconium, molybdenum and selenium in ZrSe2 and MoSe2 have been recorded photographically using a Cauchois type bent crystal (mica) spectrograph. The absorption edge shifts are used along with the data for NbSe2 (Bhide and Bahl 1971J. Phys. Chem. Solids32 1001) to propose bond schemes for these compounds.

    • Electroluminescence in lead titanate single crystals

      D A Deshpande K R Bagree B A Patki V G Kher

      More Details Abstract Fulltext PDF

      Electroluminescence in PbTiO3 single crystals is studied with variation in applied electric field, frequency (20 Hz to 5 kHz) and temperature. The EL onset depends on the rate at which the dipole switches. Extremely sharp upward rising nature of the pulses of micro second duration suggest that there is a self maintained discharge in the dielectric due to secondaryγp mechanism. Frequency dependence of EL suggests that both the secondary mechanisms, viz. theγp andγi are active after the application of a high field and the critical field at which this occurs decreases with increase in the frequency of the applied voltage. Similarly the onset voltage decreases with increase in frequency. The temperature dependence of EL at the applied frequency of 50 Hz shows that the onset voltage is intimately connected with the coercive field of the crystal and it is minimum at the Curie point. The study suggests that EL occurs in the bulk and there is a breakdown in the dielectric due to an avalanche formation.

  • Pramana – Journal of Physics | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2023-2024 Indian Academy of Sciences, Bengaluru.