Processing and Application of Ceramics 2018 Volume 12, Issue 2, Pages: 100-110
https://doi.org/10.2298/PAC1802100D
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Structural, morphological, magnetic and electrical properties of Ni-doped ZnO nanoparticles synthesized by co-precipitation method
Dasari Madhava P. (Gitam University, Department of Physics, GIT, Visakhapatnam, A. P., India)
Godavarti Umadevi (Gitam University, Department of Physics, GIT, Visakhapatnam, A.P., India + CMR Technical Campus, Medchel, Hyderabad, Telangana, India)
Mote Vishwanath (Dayanand Science College, Department of Physics, Latur, Maharashtra, India)
Weak ferromagnetic behaviour was obtained in a systematic way at room
temperature by doping of ZnO with nickel (Zn1-xNixO, where x = 0.00, 0.05,
0.15 and 0.20). The obtained results were correlated with conductivity and
impedance studies. Diamagnetic to ferromagnetic change was observed with
increased concentration of nickel. X-ray diffraction analysis confirmed
wurtzite ZnO structure of prepared nanopowders while microstrain was
increased with nickel concentration. Incorporation of nickel in ZnO
structure was confirmed using EDAX analysis, while FTIR spectroscopy
provided further information on functional groups. Transmission electron
microscopy images showed that the particle sizes are in the range of 12-20
nm, and scanning electron microscopy analyses that grain size decreases with
increase in nickel concentration. Photo luminescence studies confirmed the
presence of VO and Zni defects in the prepared samples. It was concluded
that the defect induced strain, grain boundaries and lower particle sizes
are the reasons for weak ferromagnetic behaviour of the investigated
samples.
Keywords: co-precipitation, ZnO, magnetic properties, conductivity, impedance studies