Background
Type: Article

Preparation of Mn-Zn ferrite nanocrystalline powders via mechanochemical processing

Journal: Journal of Alloys and Compounds (09258388)Year: 31 January 2008Volume: 449Issue: Pages: 65 - 67
Mozaffari M.a Ebrahimi F. Daneshfozon S. Amighian J.
DOI:10.1016/j.jallcom.2006.03.107Language: English

Abstract

Stoichiometric Mn1-xZnxFe2O4 (0 < x < 1) nanocrystalline powders in the range 25-35 nm in size were prepared via mechanochemical processing. The raw materials, Fe2O3 from a domestic source, MnO2 and ZnO, both from the Merck Company, were milled in a high-energy mill in air and annealed in various atmospheres and temperatures in order to achieve single-phase samples. Mean crystallite sizes of the annealed powders were calculated from XRD patterns, using Scherrer's formula. Magnetic measurements were performed on cold pressed samples and saturation magnetization was obtained. Also using an LCR-meter, the Curie temperature of each sample was measured. It was found that the minimum annealing temperatures for x = 0.2, 0.3, 0.4, 0.5, 0.6 and 0.75 were 950, 975, 1000, 1025, 1050 and 1100 °C, respectively. The results show that a single-phase nano-sized Mn-Zn ferrite can be achieved by annealing in an inert gas or vacuum. © 2006 Elsevier B.V. All rights reserved.