Document Type
Article
Original Publication Date
2010
Journal/Book/Conference Title
Journal of Applied Physics
Volume
107
Issue
2
DOI of Original Publication
10.1063/1.3269706
Date of Submission
October 2015
Abstract
Nickelzincferrite (NZFO) nanoparticles were synthesized via a reverse micelle method with a nonionic surfactant. Three different initial Fe3+/Fe2+ ratios were employed along with three different firing temperatures (200, 500, 1000 °C) to investigate the effects on the NZFO system. Extended x-rayabsorption fine structure (EXAFS) results reveal zinc loss at high annealing temperatures; at 1000 °C, the loss is nearly total for Fe3+/Fe2+ ratios other than 10:90. Annealing at 500 °C, however, appears necessary for fully incorporating the zinc and nickel into the spinel phase. The best nanoferrite was thus obtained using an initial Fe3+/Fe2+ ratio of 10:90 and a moderate firing temperature of 500 °C. This sample exhibits a room temperature saturation magnetization of 58 emu/g as measured via vibrating sample magnetometry, comparable with bulk values and greater than that of confirmed nano-NZFOs found in the literature. EXAFS also indicates that in all cases in which the elements adopted a spinel structure, the nickel occupies only octahedral sites and the zinc primarily tetrahedral sites.
Rights
Calvin, S., Schultz, M. D., & Glowzenski, L., et al. Annealing temperature and initial iron valence ratio effects on the structural characteristics of nanoscale nickel zinc ferrite. Journal of Applied Physics, 107, 024301 (2010). Copyright © 2010 American Institute of Physics.
Is Part Of
VCU Chemistry Publications
Comments
Originally published at http://dx.doi.org/10.1063/1.3269706