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

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dc.contributor.author Zbořil, Radek
dc.contributor.author Mašláň, Miroslav
dc.contributor.author Machala, Libor
dc.contributor.author Walla, Jan
dc.contributor.author Barčová, Karla
dc.contributor.author Martinec, Petr
dc.date.accessioned 2006-10-16T07:55:04Z
dc.date.available 2006-10-16T07:55:04Z
dc.date.issued 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.identifier.uri http://hdl.handle.net/10084/57127
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 http://dx.doi.org/10.1023/B:HYPE.0000043260.24239.48 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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