Mössbauer Effect Study of Copper Containing Nickel-Aluminate Ferrite

✍ Scribed by S.S. Ata-Allah; M.K. Fayek; H.S. Refai; M.F. Mostafa

• Publisher: Elsevier Science
• Year: 2000
• Tongue: English
• Weight: 247 KB
• Volume: 149
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8577

✦ Synopsis

A series of spinel ferrite system Ni 1؊x Cu x FeAlO 4 with (0.04x41.0) were prepared, checked by X-ray, and studied with 57 Fe MoK ssbauer e4ect spectroscopy in the 77+470 K temperature range. Characteristic spectra of paramagnetic, magnetic, and electronic types for the di4erent compositions have been observed. Cation distribution obtained from spectral analysis revealed an inverse spinel system. Hyper5ne parameters at 77 K were found to be temperature and concentration independent. At 293 K the hyper5ne 5eld decreases with increasing Cu concentration. Ne`el point T N obtained were found to decrease linearly with the compositional parameter x. Debye temperature D of this ferrite system increases with increasing Cu content. The temperature dependence of the sublattice magnetization s (T ) obeys a 1/3 power law in the 0.5(T/T N (0.99 temperature range.