Abstract
Cadmium oxide powder doped with Tb ions was synthesised by thermal decomposition of cadmium Hydroxychloride Cd(OH)Cl. The molar content of Tb is 2.6%. The purpose of the present study is to tailoring room-temperature ferromagnetic (RT-FM) properties to CdO in order to use it in the field of dilute magnetic semiconductors (DMS). The samples characterised by X-ray fluorescence (XRF) and X-ray diffraction (XRD). The optical band gap of the prepared powders was determined by diffuse reflection spectroscopy (DRS). Terbium ions doped in CdO are employed as source of FM properties. The electronic medium of Spin-Spin interaction in host CdO is studied by annealing in hydrogen atmosphere. Magnetic measurements reveal that Tb-doped CdO powder behaves as paramagnet defeating the intrinsic diamagnetic behaviour of CdO. However, after annealing in hydrogen atmosphere, RT-FM properties were created. Thus, it was proved that magnetic properties could be tailored by doping and post treatment under H2 atmosphere.
Highlights
Cadmium oxide is one of transparent conducting oxides (TCO) that have many applications in optoelectronic fields 1
The present study investigates how to control the electronic medium for S-S interaction by annealing in hydrogen atmosphere
Terbium ions were successfully doped into CdO lattice by thermal decomposition of Tb-doped Cd(OH)Cl method
Summary
Cadmium oxide is one of transparent conducting oxides (TCO) that have many applications in optoelectronic fields 1. The optoelectronic properties of CdO could be controlled by controlling its natural point defects, through doping with foreign metallic ions. It was established that doping of CdO with metallic ions of valency more than that of Cd+2 increases the concentration of conduction electrons and improves its conductivity 2. On the other hand, doping could create in CdO exotic properties, such as magnetic, optical, or mechanical, that would diverse more field of its applications. It is necessary first to dope CdO with some transition or rare earth ions, which could create in CdO FM properties under some necessary conditions, which related to the electronic medium of spin-spin (S-S) exchange interaction between localised spins of dopant ions in host CdO
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