Characterization and Thermal Behaviour of Garnets from Almandine-Pyrope Series at 1200 ◦ C
作者： R. Zboril , M. Mashlan , L. Machala , J. Walla , K. Barcova
DOI: 10.1007/978-1-4020-2852-6_61
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摘要: The natural garnets from almandine (Fe3Al2Si3O12)—pyrope (Mg3Al2Si3O12) series with the iron to magnesium atomic ratio ranging 0.2 1 were characterised and their thermal behaviour at 1200°C studied by 57Fe Mossbauer spectroscopy, X-ray powder diffraction, fluorescence, DTA, TG electron microprobe analysis. pyrope-type samples a dominant content position 24c in cubic garnet structure undergo oxidative decomposition resulting formation of paramagnetic spinel Mg(A1,Fe)204 low content, enstatite (Mg,Fe)SiO3 anorthite CaAl2Si2O8 as host compound for calcium. Contrary pyropes, iron-rich exhibit complete oxidation conforming magnetically ordered nanocrystalline γ-Fe2O3 or Mg(Fe,AI)2O4 spinels depending on initial chemical composition garnets. In reaction products garnets, cordierite (Mg2A14Si5O18) identified non-ferrous phases.
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sci-hub.st 参考文章(13)
K. Barcova, M. Mashlan, R. Zboril, P. Martinec, P. Kula, Thermal decomposition of almandine garnet: Mössbauer study Czechoslovak Journal of Physics. ,vol. 51, pp. 749- 754 ,(2001) , 10.1023/A:1017618420189
R. Zboril, M. Mashlan, K. Barcova, J. Walla, E. Ferrow, P. Martinec, Thermal behaviour of pyrope at 1000 and 1100 °C: mechanism of Fe2+ oxidation and decomposition model pacific rim conference on multimedia. ,vol. 30, pp. 620- 627 ,(2003) , 10.1007/S00269-003-0355-X
V Šepelák, D Schultze, F Krumeich, U Steinike, KD Becker, None, Mechanically induced cation redistribution in magnesium ferrite and its thermal stability Solid State Ionics. ,vol. 141, pp. 677- 682 ,(2001) , 10.1016/S0167-2738(01)00777-9
Enver Murad, F. E. Wagner, The m�ssbauer spectrum of almandine Physics and Chemistry of Minerals. ,vol. 14, pp. 264- 269 ,(1987) , 10.1007/BF00307992
Vladimír Šepelák, Dirk Baabe, Dirk Mienert, Dietrich Schultze, Frank Krumeich, FJ Litterst, Klaus D Becker, Evolution of structure and magnetic properties with annealing temperature in nanoscale high-energy-milled nickel ferrite Journal of Magnetism and Magnetic Materials. ,vol. 257, pp. 377- 386 ,(2003) , 10.1016/S0304-8853(02)01279-9
C.A. Geiger, Th. Armbruster, G.A. Lager, K. Jiang, W. Lottermoser, G. Amthauer, A combined temperature dependent 57 Fe Mössbauer and single crystal X-ray diffraction study of synthetic almandine: evidence for the Gol'danskii-Karyagin effect pacific rim conference on multimedia. ,vol. 19, pp. 121- 126 ,(1992) , 10.1007/BF00198609
K K P Srivastava, Mossbauer study of spin-spin relaxation of Fe(II) ions in natural orthopyroxenes Journal of Physics C: Solid State Physics. ,vol. 20, pp. 2161- 2168 ,(1987) , 10.1088/0022-3719/20/14/017
L.M Anovitz, E.J Essene, G.W Metz, S.R Bohlen, E.F Westrum, B.S Hemingway, Heat capacity and phase equilibria of almandine, Fe3Al2Si3O12 Geochimica et Cosmochimica Acta. ,vol. 57, pp. 4191- 4204 ,(1993) , 10.1016/0016-7037(93)90315-N
Bernard J. Wood, David Virgo, Upper mantle oxidation state: Ferric iron contents of Iherzolite spinels by 57Fe Mössbauer spectroscopy and resultant oxygen fugacities Geochimica et Cosmochimica Acta. ,vol. 53, pp. 1277- 1291 ,(1989) , 10.1016/0016-7037(89)90062-8
Radek Zboril, Miroslav Mashlan, Dimitris Petridis, Iron(III) Oxides from Thermal ProcessesSynthesis, Structural and Magnetic Properties, Mössbauer Spectroscopy Characterization, and Applications† Chemistry of Materials. ,vol. 14, pp. 969- 982 ,(2002) , 10.1021/CM0111074