Thermal behaviour of pyrope at 1000 and 1100 °C: mechanism of Fe2+ oxidation and decomposition model
作者： R. Zboril , M. Mashlan , K. Barcova , J. Walla , E. Ferrow
DOI: 10.1007/S00269-003-0355-X
关键词: Spinel 、 Analytical chemistry 、 Reaction mechanism 、 Metallurgy 、 Pyrope 、 Magnesium 、 Hematite 、 Magnesium ion 、 Chemistry 、 Electron microprobe 、 Morin transition
摘要: The mechanism of thermally induced oxidation Fe2+ from natural pyrope has been studied at 1000 and 1100 degreesC using Fe-57 Mossbauer spectroscopy in conjunction with XRD, XRF, AFM, QELS, TG, DTA electron microprobe analyses. At degreesC, the non-destructive air includes partial stabilization Fe3+ dodecahedral 24c position garnet structure simultaneous formation hematite particles (15-20 nm). incorporation magnesium ions to results suppression Morin transition temperature below 20 K. general is preserved during redox process accordance XRD data. however, oxidative conversion mixed aluminium iron oxide, Fe-orthoenstatite cristoballite was observed. During this destructive decomposition, predominantly oxidized incorporated into spinel Mg(Al,Fe)(2)O-4 partially stabilized orthoenstatite, (Mg,Fe)SiO3. combination data suggest definite reaction prevailing, including refinement chemical composition quantification products. indicates that respective distribution Fe(2+)and enstatite structures determined by total content pyrope. (Less)
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