G Sharma

Publications (2)7.48 Total impact

• Article: Effect of doping on the morphology and multiferroic properties of BiFeO3 nanorods.

  Dimple P Dutta, O D Jayakumar, A K Tyagi, K G Girija, C G S Pillai, G Sharma
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  ABSTRACT: In this study we report the synthesis of BiFeO(3) nanorods using a sonochemical technique. The nanorods had a diameter of 20-50 nm, a length of 100-500 nm and exhibit aspect ratios in the range of 5-10. However, after doping, the TEM images of Bi(0.9)Ba(0.1)Fe(0.9)Mn(0.1)O(3) and Bi(0.9)Ca(0.1)Fe(0.9)Cr(0.1)O(3) samples show that the aspect ratios of both the double doped samples have reduced considerably, while retaining the crystallinity of the particles. BiFeO(3) nanorods show a weak ferromagnetic order at room temperature, which is quite different from the linear M-H relationship reported for bulk BiFeO(3). The saturation magnetization of these BiFeO(3) nanostructures has been found to increase on doping with various metal ions (Ba(2+), Ca(2+), Mn(2+), Cr(3+)), reaching a maximum value of 1.35 emu g(-1) for the Bi(0.9)Ba(0.1)Fe(0.9)Mn(0.1)O(3) nanostructures. However, saturation of electric polarization was observed only in case of the Bi(0.9)Ca(0.1)Fe(0.9)Cr(0.1)O(3) nanostructures.
  Nanoscale 07/2010; 2(7):1149-54. · 5.91 Impact Factor
• Article: Sonochemical synthesis of lanthanide ions doped CeF3 nanoparticles: potential materials for solid state lighting devices.

  Dimple P Dutta, S Warrier, R Ghildayal, G Sharma, G Grover, A K Tyagi
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  ABSTRACT: Nanocrystalline CeF3 and CeF3 doped with Dy3+, Tb3+ and Eu3+ ions have been successfully synthesized via a mild ultrasound assisted route from an aqueous solution of cerium nitrate and potassium borofluoride. The nanoparticles obtained were characterized extensively by techniques like powder X-ray diffraction, transmission electron microscopy and selected area electron diffraction. Their luminescence properties have also been studied. The nanoparticles showed characteristic emission of respective dopants (Dy3+ and Tb3+) when excited at the 4f --> 5d transition of Ce3+. The chromaticity coordinates for these samples were calculated and it was observed that the CeF3 co doped with Dy3+ and Tb3+ gave an emission very close to white light.
  Journal of Nanoscience and Nanotechnology 08/2009; 9(8):4715-20. · 1.56 Impact Factor