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Synthesis and characterization of Ni incorporated titanium dioxide thin films

Published online by Cambridge University Press:  06 November 2018

Deepak Kumar ,
Prasanta Mandal ,
Anil Singh ,
Charu Pant  and
Sudesh Sharma Open the ORCID record for Sudesh Sharma [Opens in a new window]
Deepak Kumar
Affiliation:
Department of Physics, Graphic Era Hill University, Dehradun 248002, India
Prasanta Mandal
Affiliation:
Department of Physics, University of Petroleum and Energy Studies, Dehradun 248007, India
Anil Singh
Affiliation:
Department of Physics, Graphic Era Hill University, Dehradun 248002, India
Charu Pant
Affiliation:
Centre for Nanotechnology, University of Petroleum and Energy Studies, Dehradun 248007, India
Sudesh Sharma*
Affiliation:
Department of Physics, University of Petroleum and Energy Studies, Dehradun 248007, India
*
a)Address all correspondence to this author. e-mail: sudesh@ddn.upes.ac.in
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Abstract

Thin films of insulating Ti1−xNixO2 (x = 0.00, 0.05, 0.10, and 0.15) are synthesized by the spray pyrolysis technique. All the films are seen to crystallize into polycrystalline anatase phase of TiO2. However, weak signature of the NiTiO3 phase is also observed for the films having higher Ni ion concentration. Optical absorption analysis suggests nonmonotonous band gap decrease from 3.67 to 3.59 eV with respect to added concentration of Ni ions unto ‘x’ = 0.10 in the TiO2 matrix. The presence of ferromagnetic ordering at room temperature in Ni incorporated TiO2 films is revealed by M–H measurements. Calculated values of saturation magnetization indicate that the observed ferromagnetism is not due to the presence of Ni clusters or segregation of other ferromagnetic phase. Electrically insulating nature of the films suggests that the observed FM ordering is most probably due to the ferromagnetic interaction between bound magnetic polarons which formed due to the creation of oxygen vacancies or defects.

Keywords

ferromagneticthin filmoxide
Type
Article
Information
Journal of Materials Research , Volume 33 , Issue 24 , 28 December 2018 , pp. 4165 - 4172
Copyright
Copyright © Materials Research Society 2018 

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References

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