ESR and magnetic studies of nickel ions doped P_(2)O_(5)–ZnO–Na_(2)O glassy system

• D.A. Rayan ^[1] ; Y.H. Elbashar ^[2] ; S.S. Moslem ^[3]
  1. [1] Central Metallurgical Research and Development Institute

     Central Metallurgical Research and Development Institute

     Egipto

     
  2. [2] ELGazeera High institute for Engineering and Technology, Cairo, Egypt
  3. [3] Modern Academy for Engineering and Technology, Cairo, Egypt

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• Localización: Revista Mexicana de Física, ISSN-e 0035-001X, Vol. 66, Nº. 5, 2020, págs. 580-584
• Idioma: inglés
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• Resumen

  • We prepared 42P_(2)O_(5)-40ZnO-(18-x)Na_(2)O-(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 Ni^(2+) ions were in octahedral sites and it has _(3)A^(2g) as ground state. The spin-Hamiltonian parameters are evaluated from the electron spin resonance spectra and we found a variation of g_(k) and g_(⊥) with different nickel concentration. Interesting results are found for the number of Ni^(2+) 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.