IR @ Goa University

Browsing by Author "UmaSubramanian"

Browsing by Author "UmaSubramanian"

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  • Jeyakanthan, M.; UmaSubramanian; Tangsali, R.B.; Ramesh, A. (Physica B: Condensed Matter. 586; 2020; ArticleID_412151.)
    Structural, AC conductivity, electrochemical and magnetic properties of CoWO4 and CoWO4/PbWO4 nanocomposites are reported in the present manuscript. Structural characterization and HRTEM images of the nanocomposites confirm ...
  • Jeyakanthan, M.; UmaSubramanian; Tangsali, R.B. (Proc. Int. Conf. Industrial Applications of Nano-structured Materials. 2015; 193-196.)
    Undoped and Pb2+ doped CoWO4 nanosamples were successfully prepared by simple co-precipitation method without using surfactant in an aqueous medium and characterized. Particle size, band gap energy and the PL intensity ...
  • Patil, P.N.; UmaSubramanian; Jeyakanthan, M. (Journal of Materials Science: Materials in Electronics. 31(9); 2020; 7260-7275.)
    For the first time xBaWO4/(1-x)CaWO4 where (x = 0, 0.25, 0.5, 0.75, 1) nanocomposites powder samples were prepared by co-precipitation method and sintered at 200 degrees C and 400 degrees C. They were characterized by X-ray ...
  • Jeyakanthan, M.; UmaSubramanian; Tangsali, R.B. (Journal of Materials Science: Materials in Electronics. 29(3); 2018; 1914-1924.)
    CoWO sub(4)/PbWO sub(4) nanocomposites were successfully synthesized at room temperature (RT) by co-precipitation route without using any templates or surfactants and sintered at 600 degrees C for good crystallization. The ...
  • Naik, S.J.; UmaSubramanian; Tangsali, R.B.; Salker, A.V. (Journal of Physics D-Applied Physics. 44(11); 2011; Article ID: 115404.)
    This paper deals with optical absorption and photoluminescence properties of nanorange (22-65 nm) luminescent materials Co(1-x)Ce(x)WO(4) (where x = 0.01, 0.015, 0.02, 0.025 and 0.03) sintered in air at various temperatures. ...
  • Salkar, K.Y.; Tangsali, R.B.; Gad, R.S.; Jeyakanthan, M.; UmaSubramanian (Superlattices and Microstructures. 126; 2019; 158-173.)
    Cobalt-doped ZnO nanoparticles having chemical formula Zn sub((1-x))Co sub(x)O (x=0.05, 0.10, 0.15, 0.20) were prepared by means of auto-combustion synthesis. Formation of monophasic wurtzite structure material was confirmed ...
  • Jeyakanthan, M.; UmaSubramanian; Tangsali, R.B.; Jose, R.; Saravanan, K.V. (Journal of Materials Science: Materials in Electronics. 30(15); 2019; 14657-14668.)
    Dielectric constant epsilon' and dielectric loss epsilon" were measured in the frequency range of 500 Hz-3 MHz from room temperature (RT) to 350 degrees C for CoWO sub(4) and CoWO sub(4)/PbWO sub(4) nanocomposites sintered ...
  • Patil, P.N.; UmaSubramanian (International Journal of Advances in Management, Technology and Engineering Sciences. 4(6(I)); 2015; 14-22.)
    Thermoluminescence (TL) glow curves of X-irradiated KCl (Pure),KBr (Pure) and KCl-KBr mixed crystals have been studied in the different dose of X-irradiation with periods 40minutes,60 minutes& 120 minutes with temperature ...
  • UmaSubramanian; Naik, S.J.; Tangsali, R.B.; Salker, A.V. (Journal of Luminescence. 134; 2013; 464-468.)
    In this paper we report the bluish green upconversion intrinsic photoluminescence (PL) observed at room temperature (RT) 300 K for the nanorange (27-50 nm) Ce3+ doped and undoped CoWO(4) powder samples sintered in air at ...
  • UmaSubramanian; Naik, S.J.; Tangsali, R.B.; Salker, A.V. (Proc. Int. Conf. on Nanoscience and Nanotechnology (ICONN 2010). SRM Univ., Chennai. 24-26 Feb 2010. 2010; 115-116)
    In this work nano range C0WO(4) powder samples doped with different concentrations of Ce3+ ions were prepared by coprecipitation method. The samples were also sintered at various temperatures and characterized using ...