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Published in:
23-01-2016
Investigation of size dependent Curie temperature and magnetization of bismuth substituted zinc ferrite (ZnBixFe2−xO4) nanoparticles
Published in: Journal of Materials Science: Materials in Electronics | Issue 5/2016
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Abstract
The spinel zinc-bismuth ferrites with nominal composition of ZnBixFe2−xO4 (x = 0, 0.5, 0.1, 0.15, 0.2, 0.25, 0.3) have been synthesized by ball milling technique. Commercially available bismuth, zinc and iron oxide powders were first mixed and then annealed at 1100 °C in an oxygen environment furnace for 10 h. The samples were then milled for 2 h in a Fritsch mille. The average grain size were estimated from the X-ray line broadening of the (311) reflection and transmission electron microscopy (TEM). The micro and nanostructure investigation was carried out by a scanning electron microscope (SEM) with maximum magnification of 20,000. Magnetic properties of the as-prepared ferrites were studied by means of alternating gradient force magneto-meter (AGFM) and Faraday balance measurement. An increasing bismuth content in ZnBixFe2−xO4 leads to a decrease in the saturation magnetization, coercive field and Neel temperature. These results can be attributed to the substitution of Bi3+ ions in the ferrite system as nonmagnetic cations.