• Sarvari Khatoon

      Articles written in Bulletin of Materials Science

    • Fabrication of nano-sized solid solution of Zn1−𝑥Mn𝑥O (𝑥 = 0.05, 0.10, 0.15) in reverse microemulsions: Structural characterization and properties

      Sarvari Khatoon Aparna Ganguly Tokeer Ahmad

      More Details Abstract Fulltext PDF

      Mn-doped ZnO nanoparticles were synthesized by reverse micellar method using Tergitol NP9 as a surfactant for the first time. These nanoparticles were characterized using powder X-ray diffraction, transmission electron microscopy and selected area electron diffraction analysis. Structural analysis and optical studies revealed that manganese is incorporated into the ZnO host lattice forming a solid solution. Transmission electron microscopic studies show that the particle size increases from 20–50 nm on increasing the dopant concentration from 0.05–0.15. The specific surface area of Zn1−𝑥Mn𝑥O (𝑥 = 0.05, 0.10 and 0.15) as calculated using BET method was found to be 202.62, 145.78 and 75.66 m2g-1, respectively which are higher than the reported values so far.

    • Optical, magnetic and structural characterization of Zn1−𝑥Co𝑥O nanoparticles synthesized by solvothermal method

      Tokeer Ahmad Sarvari Khatoon Kelsey Coolahan

      More Details Abstract Fulltext PDF

      Nanoparticles of Co-doped ZnO with 3.8, 7.2 and 11.5 wt% were synthesized by solvothermal method through oxalate precursor route. X-ray diffraction studies showed the formation of hexagonal ZnO structure for 𝑥 = 0.038, however, secondary phase of Co3O4 arises on increasing the Co content up to 11.5%. Transmission electron microscopic studies showed that particles are in the nano-metric regime and the grain size decreases on increasing the Co concentration. Optical reflectance measurements showed an energy bandgap, which decreases on increasing Co concentration. Specific surface area of these nanoparticles was found to be very high and comes out to be 97.6, 112.1 and 603.8 m2g-1, respectively. All the solid solutions showed paramagnetism with weak antiferromagnetic interactions. It is seen that the antiferromagnetic interaction increases on increasing Co concentration.

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    • Dr Shanti Swarup Bhatnagar for Science and Technology

      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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      Posted on July 25, 2019

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