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Thakur J.,Kishanchand Chelaram College | Dutta D.P.,Kishanchand Chelaram College | Bagla H.,Kishanchand Chelaram College | Tyagi A.K.,Bhabha Atomic Research Center
Journal of the American Ceramic Society | Year: 2012

Eu 3+ and Tb 3+ doped in nanocrystalline InBO 3, GdBO 3, and LaBO 3having three different morphs of calcite (CaCO 3) such as Calcite, Vaterite, and Aragonite, respectively, were synthesized by glycine-nitrate combustion method. Luminescence due to Eu 3+ and Tb 3+ doped individually as well as simultaneously in these three different morphs of calcite were investigated and compared. Also the effect of concentration of dopant ions on the luminescence was studied. The highest photoluminescence emission intensity was observed for RE 0.05M 0.95BO 3(RE = Eu 3+, Tb 3+, M = In, Gd, La) samples. Further increase in doping led to concentration quenching of the luminescence. In case of the co-doped borates, the energy transfer between the co-doped rare earth ions was influenced by the host crystal structure. This study reveals that there is remarkable effect of the crystal structure of host and concentration of dopant ions on the luminescence. © 2011 The American Ceramic Society. Source


Thakur J.,Kishanchand Chelaram College | Shukla R.,Chemistry Division | Raje N.,Bhabha Atomic Research Center | Ghonge D.,Bhabha Atomic Research Center | And 2 more authors.
Nanoscience and Nanotechnology Letters | Year: 2011

In this study, a series of nanocrystalline single-phasic RECrO 4(La-Lu, except Ce and Pm) compounds have been synthesized by glycine-nitrate combustion method in fuel-deficient ratio. The compounds were characterized by techniques such as XRD (X-ray diffraction) and TEM (Transmission Electron Microscopy). RECrO3 series of compounds were obtained after decomposition of the respective RECrO4 compounds. XRD studies of the respective products, confirms the formation of mono-phasic rare-earth chromates (RECrO4) and chromites (RECrO3). Thermal behavior of all the rare-earth chromates (RECrO4) was studied using simultaneous TG-DTA. Decreasing trend was observed in decomposition temperature from LaCrO4 to LuCrO4. Stability of RECrO4 compounds have been correlated with structural, thermodynamics and heat transport aspects of the respective compounds. Copyright © 2011 American Scientific Publishers. All rights reserved. Source

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