Pekala, M.; Berry, F. and Widatallah, H.M.
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Nanocrystalline magnesium doped ferrites with grain sizes between 60 and 11 run were prepared by the ball milling. Magnetization of the iron-milled ferrite diminishes monotonically with temperature and vanishes above the relatively high Curie temperature T-C of 900 K. A milling process suppresses TC down to 830 K, which reveals the exchange interaction diminishing with tire reduced grain sizes. Tire room temperature magnetic moment per formula unit diminishes from 2.15 mu(B) for non-milled ferrite to 1.27 mu(B) for 11 run sample. Tire hyperfine magnetic fields derived from Mossbauer spectra are remarkably suppressed where the grain sizes are reduced below 20 nm.
|Item Type:||Journal Article|
|Extra Information:||The original publication is available at www.springerlink.com---
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|Academic Unit/Department:||Science > Life, Health and Chemical Sciences|
|Depositing User:||David Shuker|
|Date Deposited:||14 Nov 2006|
|Last Modified:||02 Dec 2010 19:54|
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