Physics:Magnadur
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Magnadur is a sintered barium ferrite, specifically BaFe12O19 in an anisotropic form.[1] It is used for making permanent magnets. The material was invented by Mullard and was used initially particularly for focussing rings on cathode-ray tubes. Magnadur magnets retain their magnetism well, and are often used in education, eg. as slabs with poles on the large faces.[2][3] Magnadur can also be used in DC motors.[4]
Physical characteristics
- Remanence 0.9 T
- Coercivity 110 kA/m
- Maximum energy product, 20 kJm-3 - at 86 kAm-1
References
- ↑ Ellis, Hendrina; Trust, Nuffield-Chelsea Curriculum (1984). Book of Data. Nuffield-Chelsea Curriculumn Trust. p. 132. ISBN 0-582-35448-X.
- ↑ "Play with magnets". https://spark.iop.org/play-magnets.
- ↑ Wenham, Martin W. (18 November 2004). Understanding Primary Science: Ideas, Concepts and Explanations. SAGE Publications Ltd. p. 234. ISBN 1412901634. https://archive.org/details/understandingpri0000wenh/page/234.
- ↑ Magnadur Magnets for Direct Current Motors. Mullard Ltd. 31 December 1970. ISBN 0901232106.
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