• H H Joshi

      Articles written in Bulletin of Materials Science

    • Critical current density of the superconductor YBa1·5Ca0·5Cu3O7\t-\gd

      R B Jotania S M Joshi G J Baldha H H Joshi R G Kulkarni

      More Details Abstract Fulltext PDF

      The real and imaginary (lossy) components of a.c. susceptibility of high-Tc superconductor YBa1·5Ca0·5Cu3O7−δ were measured as a function of temperature for different a.c. fields and frequencies. From the lossy component of the a.c. susceptibility the transport critical current density and its temperature dependence have been computed on the basis of Kim’s critical state model.

    • Magnetic properties of magnesium-cobalt ferrites synthesized by co-precipitation method

      H H Joshi P B Pandya K B Modi N N Jani G J Baldha R G Kulkarni

      More Details Abstract Fulltext PDF

      The alternating current (a.c.) low field susceptibility vs temperature, magnetization and57Fe Mössbauer effect measurements are reported for the spinel solid solution series MgxCo1−xFe2O4 synthesized by a wet-chemical method before and after high temperature annealing. The observed features for the wet samples, such as the coexistence of paramagnetic doublet and magnetic sextets in Mössbauer spectra and lower saturation magnetization values confirm small particle ferrite behaviour. Especially, Mössbauer spectra of wet samples reveal the presence of superparamagnetic particles which exist simultaneously with ferrimagnetic regions in the materials well supported by a.c. susceptibility data. The high temperature annealing changes the wet-prepared ferrites into the ordered magnetic structure of ceramic ferrites.

    • Magnetic ordering in Mg1+xMnxFe2−2xO4 system

      N N Jani B S Trivedi H H Joshi G K Bichile R G Kulkarni

      More Details Abstract Fulltext PDF

      Magnetization measurements of the ferrite system Mg1+xMnxFe2−2xO4 were undertaken primarily to study variation of the saturation magnetization with manganese concentration and to gain information about the type of magnetic ordering. The observations indicate the existence of Yafet-Kittel (YK) type of magnetic ordering in this system which is well supported by results of Mössbauer effect measurements. A molecular field analysis of the YK spin ordering using the three-sublattice model is shown to explain the experimental data satisfactorily.

  • Bulletin of Materials Science | News

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2017-2019 Indian Academy of Sciences, Bengaluru.