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dc.contributor.author King, J.G.
dc.contributor.author Ranganai, R.T.
dc.date.accessioned 2009-06-25T12:55:45Z
dc.date.available 2009-06-25T12:55:45Z
dc.date.issued 2001
dc.identifier.citation King, J.G. et al (2001) Determination of magnetite grain-size using the Hopkinson effect - examples from Botswana rocks, Botswana Journal of Earth Sciences, Volume 5 en_US
dc.identifier.issn 1013-1493
dc.identifier.uri http://hdl.handle.net/10311/338
dc.description.abstract The Hopkinson effect is the increase of magnetic susceptibility with temperature from near room temperature to near the Curie point. Although this effect has been known for more than a century, it has not been effectively utilised as an analysing tool in palaeo, rock and environmental magnetic studies. This is partly due to the poor understanding of the influence of magnetite (Fe,O.)grain parameters on the Hopkinson effect. In an attempt to study the effects of grain size on the Hopkinson effect, magnetite samples with well-defined grain sizes have been used. it was found that in general, magnetic susceptibility enhancement factor (SEF) obtained by heating the sample in a non-oxidising environment, increase with decreasing grain size. The relation of SEF to grain size is linear when plotted on a log-log scale. This relation has been used to infer grain sizes (hence magnetic domains) for some selected Botswana rocks. The inferred magnetic domains are consistent with independent predictions from hysteresis measurements for the same samples. en_US
dc.language.iso en en_US
dc.publisher Botswana Geoscientists Association en_US
dc.subject Magnetite en_US
dc.subject Magnetic susceptibility en_US
dc.subject Magnetic domains en_US
dc.subject Hopkinson effect en_US
dc.subject Botswana rocks en_US
dc.title Determination of magnetite grain-size using the Hopkinson effect - examples from Botswana rocks en_US
dc.type Published Article en_US


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