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

Published online by Cambridge University Press:  04 May 2015

Tokeer Ahmad  and
Sarvari Khatoon
Tokeer Ahmad*
Affiliation:
Nanochemistry Laboratory, Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India
Sarvari Khatoon
Affiliation:
Nanochemistry Laboratory, Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India
*
a)Address all correspondence to this author. e-mail: tahmad3@jmi.ac.in
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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.

Keywords

chemical synthesisx-ray diffraction (XRD)optical propertiesmagnetic properties
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 10 , 28 May 2015 , pp. 1611 - 1618
Copyright
Copyright © Materials Research Society 2015 

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