The Effects of Heat Treatment and Atmosphere on Magnetic Properties of Nano-Structured Nickel Ferrite Glass-Ceramic

A. M. Molavi,; S. M. Mirkazemi,; A. Beitollahi,

The Effects of Heat Treatment and Atmosphere on Magnetic Properties of Nano-Structured Nickel Ferrite Glass-Ceramic

Authors

School of Material Science and Engineering, Iran University of Science and Technology

Abstract

The effects of temperature, time and atmosphere on microstructure and magnetic properties of NiFe2O4 glassceramic were investigated utilizing differential thermal analysis, X-ray diffraction, vibrating sample magnetometer and scanning electron microscope techniques. Various compositions were studied in the Na2O-NiO-Fe2O3-B2O3-SiO2 system to obtain amorphous phase. The sample heat-treated in graphite bed at 510°C for 1 hr showed higher magnetization than the one heattreated in the air under the same condition. XRD analysis showed the presence of nickel ferrite and some non-magnetic phases such as sodium borate and silicate phases in the heat treated samples. The maximum magnetization of samples reduced by increasing the holding time from 1hr to 3 hr at 510°C. Increment of temperature to 700°C increased the amount of NiFe2O4 and maximum magnetization.

Keywords