ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract An homogeneous BaO ·Fe2O3 ·B2O3 glass containing 30% Fe2O3 is prepared by a splat-cooling technique. X-ray and electron diffraction reveal the product to be amorphous at room temperature. The crystallization, as shown by DTA studies, begins at 750 K, and up to 950 K, a temperature at which BaFe12O19 is shown to be present, the crystallizing products are mainly evolutive. The magnetic measurements show a probably mictomagnetic behaviour at low temperature with a maximum of magnetic susceptibility at 12 (±1) K. At higher temperature the susceptibility obeys a Curie-Weiss law with large negative Weiss constant and low Curie constant per Fe3+ ions. After crystallization the product is ferrimagnetic and could be used as a permanent magnet. Mössbauer study reveals that the glass mainly consists of Fe3+ ions in distorted sites and a hyperfine structure at low temperature; the magnetic ordering temperature is estimated to be about 44 (±1) K.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00552429
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