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      Permanent link:
      https://www.ias.ac.in/article/fulltext/boms/024/05/0435-0440

    • Keywords

       

      Crystal growth; didymium molybdate; gel method; morphology; EDAX.

    • Abstract

       

      Experiments on the growth of mixed rare earth (didymium—a combination of La, Nd, Pr and Sm) molybdates in silica gel medium are reported. The optimum conditions conducive for the growth of these crystals are described and discussed. Concentration programming is reported to enhance the size of crystals by two-fold; the maximum size obtained being about 1 mm3. EDAX results suggest the crystals to be heptamolybdates of type R2Mo7O24, bearing composition La1.23Nd0.43Pr0.29 Sm0.05Mo7O24. The didymium molybdate crystals assume morphologies corresponding to those of spherulites, platelets, cuboids and coalesced crystals. Twinned structure in didymium molybdate crystals are also reported. It is explained that spherulitic morphologies result from aggregates of crystals joining in a spherical envelope. It is suggested that the crystals of didymium molybdates grow by two-dimensional spreading and piling up of layers.

    • Author Affiliations

       

      Sanjay Pandita1 Ravender Tickoo1 K K Bamzai1 P N Kotru1 Neera Sahni2

      1. Department of Physics, University of Jammu, Jammu 180 006, India
      2. Department of Geology, Panjab University, Chandigarh 160 014, India
    • Dates

       

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