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Thermal History Dependent Al Distribution in Aluminum Substituted Strontium Hexaferrite

1
University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
2
South Ural State University, Lenin’s Prospect 76, Chelyabinsk 454080, Russia
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Author to whom correspondence should be addressed.
Materials 2020, 13(4), 858; https://doi.org/10.3390/ma13040858
Received: 29 January 2020 / Revised: 11 February 2020 / Accepted: 12 February 2020 / Published: 13 February 2020
(This article belongs to the Special Issue Structure and Properties of Crystalline Materials)
Single crystals of aluminum substituted strontium hexaferrite SrFe12–xAlxO19 were grown from sodium oxide based flux. The substitution level aimed for was x = 1.2. Annealing experiments performed on single crystals show that the Al distribution on the five iron sites of the hexaferrite structure depends on the annealing time at 900 °C. Single crystal X-ray diffractometry shows that annealing a crystal after the initial synthesis has an impact on the Al content on the octahedrally and tetrahedrally coordinated sites. Furthermore, it was found that heating in a corundum crucible increases the overall Al content. Magnetic measurements show that annealing in a platinum or corundum crucible decreases coercivity and remanence while the saturation magnetization is hardly influenced. View Full-Text
Keywords: cation distribution; aluminum substituted hexaferrite; magnetic materials cation distribution; aluminum substituted hexaferrite; magnetic materials
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Häßner, M.; Vinnik, D.A.; Niewa, R. Thermal History Dependent Al Distribution in Aluminum Substituted Strontium Hexaferrite. Materials 2020, 13, 858.

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