Synthesis and characterization of TM-doped CuO (TM = Fe, Ni)

• Published in: Journal of non-crystalline solids Vol. 354; no. 42; pp. 4830 - 4832
• Main Authors: Meneses, C.T., Duque, J.G.S., Vivas, L.G., Knobel, M.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Oxford Elsevier B.V 01-11-2008; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Magnetic properties; Magnetic properties and materials; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Physics; Sintering; X-ray diffraction; 75.50.Ee; X-ray diffraction; 61.66.Fn; Sintering; 61.05.cp; Magnetic properties; Magnetization; Doping; Polycrystals; XRD; Nickel additions; Magnetic susceptibility; Impurities; Temperature effects; Neel temperature; Ferromagnetism; Iron additions; Copper oxide
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2008.04.025

Polycrystalline Cu
1−
x
TM
x
O samples (
x
=
0 and 0.06; TM
=
Ni
2+ and Fe
3+) were grown using a co-precipitation method. The structural and magnetic properties were investigated by means of temperature dependent magnetic susceptibility and room temperature X-ray powder diffraction (XRPD). The XRPD analyses of the samples reveal the formation of single phase with structure isomorphous to the CuO. Interestingly,
T-dependent magnetization shows the reduction of Néel temperature,
T
N
, from 213
K in the copper oxide to 70
K in the Fe-doped sample (
x
=
0.06). Because in the Ni-doped samples
T
N
seems to be unaffected, this decrease in
T
N
is believed to be due to the different electronic structure of the dopant. The ferromagnetic behavior observed at room temperature in all samples can be related to both the level of oxygen (excess or vacancy) of our samples and to the difference in the magnetic structure of the dopant.