Abstract

RAYAN, D.A.; ELBASHAR, Y.H.  and  MOSLEM, S.S.. Electron spin resonance and magnetic studies of nickel ions doped P₂O₅-ZnO-Na₂O glassy system. Rev. mex. fis. [online]. 2020, vol.66, n.5, pp.580-584.  Epub Jan 31, 2022. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.66.580.

We prepared 42P2O5-40ZnO-(18-x)Na2O-(x)NiO glasses doped with xNiO where 1 ≤ x ≤ 6 mol.%. The optical absorption indicates that the nickel ions exist in both sites tetrahedral and octahedral as the concentration of NiO is increased. This investigation has provided the increasing degree of disorder in the glass network at higher concentrations of NiO. The magnetic characteristics investigated using two techniques: electron spin resonance spectra and magnetic properties using vibrating sample magnetometer at room temperature. The electron spin resonance spectra exhibit resonance signal without hyperfine interaction of all the investigated glass samples. It is found that Ni2+ ions were in octahedral sites and it has 3A 2g as ground state. The spin-Hamiltonian parameters are evaluated from the electron spin resonance spectra and we found a variation of g || and g ⊥ with different nickel concentration. Interesting results are found for the number of Ni2+ ions participating in resonance (N) and paramagnetic susceptibility (χ). The magnetic properties were performed at room temperature under an applied field of 20 kOe and the hysteresis loops of the powders were extracted for all the considered samples.

Keywords : Phosphate glass; Transition metal ions; ESR characterization; magnetic properties.