Synthesis and study of nanocrystalline Ni–Cu–Zn ferrites prepared by oxalate based precursor method

• Published in: Journal of alloys and compounds 2011-06, Vol.509 (25), p.7004-7008
• Main Authors: Raghavender, A.T., Shirsath, Sagar E., Vijaya Kumar, K.
• Format: Article
• Language: English
• Subjects: Bands; Dielectric loss; Doping; Electrical; Ferrites; Magnetic properties; Nanocrystalline; Nanocrystals; Nickel; Ni–Cu–Zn ferrites; Oxalate method; Oxalates; Spectroscopy; Structural
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2011.03.127

► Oxalate based precursor method. ► Nanocrystalline Ni 0.5+1.5 x Cu 0.3Zn 0.2Fe 2− x O 4 (0 ≤ x ≤ 0.5). ► To our knowledge no reports are available on Ni 0.5+1.5 x Cu 0.3Zn 0.2Fe 2− x O 4 ferrites. Nanocrystalline ferrites of compositions Ni 0.5+1.5 x Cu 0.3Zn 0.2Fe 2− x O 4 (0 ≤ x ≤ 0.5) have been synthesized by using oxalate based precursor method at very low temperature. The Ni–Cu–Zn ferrite powder particles were obtained at 450 °C and they exhibit a crystallite size of 16–24 nm. The lattice constants were found nearly equal in all these samples due to minute difference in the ionic radius between Ni 2+ and Fe 3+ ions. The thermal analysis has showed the ferrite phase formation at very low temperature 377 °C. The two main spectroscopic bands corresponding to lattice vibrations were observed in the wavelength range from 300 to 1000 cm −1. The IR bands at 570 cm −1 ( v 1) and 390 cm −1 ( v 2) were assigned to tetrahedral (A) and octahedral [B] groups. The spectroscopic bands shift with the increase of doping concentration. The magnetization was found to decrease with increasing doping concentration. The dielectric constant ( ɛ′) and dielectric loss tangent (tan δ) decreased with increase of frequency. The dielectric constant and dielectric loss obtained for the nanocrystalline ferrite samples appeared to be lower than that of the ferrites prepared by other synthesis techniques.