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dc.contributor.authorZbořil, Radek
dc.contributor.authorMašláň, Miroslav
dc.contributor.authorMachala, Libor
dc.contributor.authorWalla, Jan
dc.contributor.authorBarčová, Karla
dc.contributor.authorMartinec, Petr
dc.date.accessioned2006-10-16T07:55:04Z
dc.date.available2006-10-16T07:55:04Z
dc.date.issued2004
dc.identifier.citationHyperfine interactions. 2004, vol. 156-157, no. 1-4, p. 403-410.en
dc.identifier.issn0304-3843
dc.identifier.issn1572-9540
dc.identifier.urihttp://hdl.handle.net/10084/57127
dc.description.abstractThe 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.isoenen
dc.publisherSpringeren
dc.relation.ispartofseriesHyperfine interactionsen
dc.relation.urihttp://dx.doi.org/10.1023/B:HYPE.0000043260.24239.48en
dc.subjectmaghemiteen
dc.subjectnanoparticlesen
dc.subjectthermal decompositionen
dc.subjectsuperparamagnetic relaxationen
dc.titleCharacterization and thermal behaviour of garnets from almandine-pyrope series at 1200 degrees Cen
dc.typearticleen
dc.identifier.locationNení ve fondu ÚKen
dc.identifier.doi10.1023/B:HYPE.0000043260.24239.48
dc.identifier.wos000224130500062


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