Ionic disorder and Yaffet–Kittel angle in nanoparticles of ZnFe₂O₄ prepared by sol‐gel method

Abstract

ZnFe 2 O 4 nanoparticles have been prepared by sol-gel methods. Mössbauer spectra from 4.2 K to RT showed their magnetic ordering took place at much higher temperature than that of bulk zinc ferrite. Mössbauer measurements that cover the temperature range 4.2 K to room temperature were acquired in zero field and an applied magnetic field of 5 T. The large increase of T N for nanoparticles can be attributed mainly to the redistribution of Fe and Zn cations on the A and B sites. Nanoparticles with smaller size have bigger θ YK (Yaffet -Kittel angle).

Temperature and composition dependence of magnetic properties of cobalt–chromium co-substituted magnesium ferrite nanomaterials

“…The obtained results are in close agreement with the studies reported earlier for spinel ferrites [14,15]. The center shift results from the electrostatic interaction between the charge distribution of the nucleus and s-electrons with finite probability being found in the region of the nucleus.…”

ZnFe2O4 tubes: Synthesis and application to gas sensors with high sensitivity and low-energy consumption

“…All reagents were of analytical grade and used as received without further purification. ZnFe 2 O 4 tubes were synthesized by pyrolysis of PVA-assisted Zn/Fe nitrate gels [16] within the AAO membrane. The typical synthetic process was similar to our previously reported work [12] except that the final calcination temperature was increased from 380 to 450 • C and the sol-precursor concentration was chosen to be 0.15, 0.25 and 0.40 M, respectively.…”

Structural characterization and magnetic properties of superparamagnetic zinc ferrite nanoparticles synthesized by the coprecipitation method

“…Several methods such as ball milling [11], sol-gel [12], coprecipitation [13], hydrothermal [14] auto-combustion route [15] and ultrasonic cavitation [16] have been used to synthesize and investigate the magnetic properties of zinc ferrite nanoparticles. However, the coprecipitation is a simple technique to synthesize the ferrite nanoparticles at low temperatures and often without calcination at high temperatures.…”