Characterization and thermal behaviour of garnets from almandine-pyrope series at 1200 degrees C

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Show simple item record Zbořil, Radek Mašláň, Miroslav Machala, Libor Walla, Jan Barčová, Karla Martinec, Petr 2006-10-16T07:55:04Z 2006-10-16T07:55:04Z 2004
dc.identifier.citation Hyperfine interactions. 2004, vol. 156-157, no. 1-4, p. 403-410. en
dc.identifier.issn 0304-3843
dc.identifier.issn 1572-9540
dc.description.abstract The natural garnets from almandine (Fe3Al2Si3O12) -pyrope (Mg3Al2Si3O12) series with the iron to magnesium atomic ratio ranging from 0.2 to 1 were characterised and their thermal behaviour at 1200degreesC studied by Fe-57 Mossbauer spectroscopy, X-ray powder diffraction, X-ray fluorescence, DTA, TG and electron microprobe analysis. The pyrope-type samples with a dominant magnesium content at position 24c in the cubic garnet structure undergo oxidative decomposition at 1200degreesC resulting in the formation of the paramagnetic spinel Mg(Al, Fe)(2)O-4 structure with a low iron content, enstatite (Mg, Fe) SiO3 and anorthite CaAl2Si2O8 as the host compound for calcium. Contrary to pyropes, the iron-rich garnets exhibit complete oxidation at 1200degreesC conforming to the formation of magnetically ordered nanocrystalline gamma-Fe2O3 or Mg(Fe, Al)(2)O-4 spinels depending on the initial chemical composition of the garnets. In the reaction products of iron-rich garnets, cordierite (Mg2Al4Si5O18) and anorthite were identified as non-ferrous phases. en
dc.language.iso en en
dc.publisher Springer en
dc.relation.ispartofseries Hyperfine interactions en
dc.relation.uri en
dc.subject maghemite en
dc.subject nanoparticles en
dc.subject thermal decomposition en
dc.subject superparamagnetic relaxation en
dc.title Characterization and thermal behaviour of garnets from almandine-pyrope series at 1200 degrees C en
dc.type article en
dc.identifier.location Není ve fondu ÚK en
dc.identifier.doi 10.1023/B:HYPE.0000043260.24239.48
dc.identifier.wos 000224130500062

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