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Structural characterization and properties of nanocrystalline Sn1−xCoxO2 based dilute magnetic semiconductors

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Abstract

Monophasic Sn1−xCoxO2 (x = 0.05, 0.10, and 0.15) nanoparticles with tetragonal structure have been successfully synthesized by solvothermal method using oxalate precursor route. Powder x-ray diffraction and selected area electron diffraction studies confirmed highly crystalline cassiterite SnO2 structure. The contraction of lattice constants confirmed the incorporation of Co2+ in SnO2 host lattice. Hexagonal nanoparticles with average grain size of 8–13 nm have been formed. With the increasing Co content, the decreasing crystallite size of SnO2 with increasing surface areas from 194 to 219 m2/g was found. The percentage reflectance increases on increasing the cobalt concentration, and a noticeable blue shift appeared. The band gap was found to be 3.85, 3.91, and 4.09 eV, respectively. Co-doped SnO2 showed distinct magnetic behavior with different Co2+ concentration. For x = 0.05 and 0.10, nanoparticles showed paramagnetism with antiferromagnetic interaction, however, on further increasing x = 0.15, the nanoparticles showed canted antiferromagnetic coupling.

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ACKNOWLEDGMENTS

TA thanks CSIR, Govt. of India for financial support of the research project (No. 01(2448)/10EMR-II). SK thanks UGC and CSIR for research fellowships. The authors also thank Prof. K.V. Ramanujachary and Prof. S.E. Lofland, Rowan University, USA for magnetic measurements as well as for valuable discussions.

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  1. Nanochemistry Laboratory, Department of Chemistry, Jamia Millia Islamia, New Delhi, 110025, India

    Tokeer Ahmad & Sarvari Khatoon

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  1. Tokeer Ahmad
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Correspondence to Tokeer Ahmad.

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Contributing Editor: Michael E. McHenry

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Ahmad, T., Khatoon, S. Structural characterization and properties of nanocrystalline Sn1−xCoxO2 based dilute magnetic semiconductors. Journal of Materials Research 30, 1611–1618 (2015). https://doi.org/10.1557/jmr.2015.102

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