Mössbauer Spectroscopic Identification of Iron Oxides in Nontronite from Hohen Hagen, Federal Republic of Germany
作者： Paul R. Lear
DOI: 10.1346/CCMN.1988.0360414
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摘要: Iron impurities in the Hohen Hagen nontronite (NG-1) were identified as maghemite and goethite. The phase was magnetically ordered at both room temperature 87 K, with hyperfine magnetic fields of 48.6 50.7 tesla, respectively. Due to properties this phase, it easily separated from aqueous dispersions clay using a hand magnet. X-ray powder diffraction analysis revealed maghemite, quartz, phyllosilicate phase. impurity goethite remained non-magnetic < 2-~m fraction clay, displayed order only K (47.44 tesla field), accounted for about 8% total area M/Sssbauer spectrum.
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