• N JAGANNATHA

      Articles written in Bulletin of Materials Science

    • Studies on impurity incorporation in cadmium oxalate crystals grown by gel method

      N Jagannatha P Mohan Rao

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      Aspects of gel growth of cadmium oxalate single crystals doped with monovalent (Li+, Na+, K+ and NH4+) and divalent (Ca2+, Co2+, Ni2+ and Zn2+) cation impurities are discussed. The growth experiments were carried out by single diffusion method. In this paper the effect of composition of the supernatant solution is considered. Rigorous characterization involves determination of composition of cations by employing atomic absorption spectrophotometer and of anions by titration method. The Pauling radius, hydration energy and distribution coefficient of the cations are tabulated and the results are described and discussed.

    • Thermal, optical and electrical susceptibility studies of pure and calcium-doped nickel cadmium oxalate crystals

      P S ROHITH N JAGANNATHA K V PRADEEP KUMAR

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      Novel crystals of pure nickel cadmium oxalate (NCO) and calcium-doped nickel cadmium oxalate (CNCO) were grown by single diffusion method in silica hydrogel by optimizing the growth parameters. The grown crystals were characterized using field-emission scanning electron microscope, energy-dispersive X-ray (EDX) analysis, Fourier transform infrared spectroscope, X-ray diffraction (XRD), thermogravimetric analysis (TGA) and UV–visible spectrometer. Ca$^{2+}$ ions were used to occupy the vacancies of intrinsically available Ni$^{2+}$ and Cd$^{2+}$ ions in the lattice of NCO crystals. This causes change in morphology of NCO crystals and resulted in the growth of CNCO. Crystallinity and lattice parameters of the grown crystals are analysed by XRD technique. Thermal studies show the thermal stability of grown crystals. Number of water molecules present and molecular weight of the crystals were also determined using EDX and TGA studies. Electrical susceptibility, real and imaginary parts of the dielectric constant, energy gap of the as-grown crystals were calculated using the UV–visible spectroscopy. The results of doped crystal were compared with undoped NCO crystal.

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      Posted on October 12, 2020

      Prof. Subi Jacob George — Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bengaluru
      Chemical Sciences 2020

      Prof. Surajit Dhara — School of Physics, University of Hyderabad, Hyderabad
      Physical Sciences 2020

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