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Investigation of Crystalline Phases in the α-Fe2O3/α-Al2O3 System

Mira Ristić   ORCID icon orcid.org/0000-0003-0033-9840 ; Division of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia
Stanko Popović ; Department of Physics, Faculty of Science, P.O. Box 331, HR-10002 Zagreb, Croatia
Svetozar Musić ; Division of Materials Chemistry, Ruđer Bošković Institute, P. O. Box 180, HR-10002 Zagreb, Croatia

Puni tekst: engleski, pdf (10 MB) str. 397-404 preuzimanja: 445* citiraj
APA 6th Edition
Ristić, M., Popović, S. i Musić, S. (2009). Investigation of Crystalline Phases in the α-Fe2O3/α-Al2O3 System. Croatica Chemica Acta, 82 (2), 397-404. Preuzeto s https://hrcak.srce.hr/39657
MLA 8th Edition
Ristić, Mira, et al. "Investigation of Crystalline Phases in the α-Fe2O3/α-Al2O3 System." Croatica Chemica Acta, vol. 82, br. 2, 2009, str. 397-404. https://hrcak.srce.hr/39657. Citirano 30.03.2020.
Chicago 17th Edition
Ristić, Mira, Stanko Popović i Svetozar Musić. "Investigation of Crystalline Phases in the α-Fe2O3/α-Al2O3 System." Croatica Chemica Acta 82, br. 2 (2009): 397-404. https://hrcak.srce.hr/39657
Harvard
Ristić, M., Popović, S., i Musić, S. (2009). 'Investigation of Crystalline Phases in the α-Fe2O3/α-Al2O3 System', Croatica Chemica Acta, 82(2), str. 397-404. Preuzeto s: https://hrcak.srce.hr/39657 (Datum pristupa: 30.03.2020.)
Vancouver
Ristić M, Popović S, Musić S. Investigation of Crystalline Phases in the α-Fe2O3/α-Al2O3 System. Croatica Chemica Acta [Internet]. 2009 [pristupljeno 30.03.2020.];82(2):397-404. Dostupno na: https://hrcak.srce.hr/39657
IEEE
M. Ristić, S. Popović i S. Musić, "Investigation of Crystalline Phases in the α-Fe2O3/α-Al2O3 System", Croatica Chemica Acta, vol.82, br. 2, str. 397-404, 2009. [Online]. Dostupno na: https://hrcak.srce.hr/39657. [Citirano: 30.03.2020.]

Sažetak
Mixtures containing the desired weight ratios of α-Fe2O3 and γ-AlOOH were homogenized in the planetary mill, then pressed into tablets and heated up to 1200 °C. All samples were characterized by X-ray diffraction, Mössbauer spectroscopy, Field emission scanning electron microscopy and Energy dispersive X-ray analysis. Two types of solid solutions of general formula α-(AlxFe1-x)2O3 were found; one solid solution was closely related to α-Fe2O3 the other to α-Al2O3 The terminal solid solubility limits, r = 27.0 ± 0.5 mole ratio of α-Al2O3 in α-Fe2O3 and r = 9.0 ± 0.5 of α-Fe2O3 in α-Al2O3 were determined. The Mössbauer spectra showed a broadening of spectral lines and a decrease in the hyperfine magnetic field of α-Fe2O3 with incorporation of Al3+ ions in the α-Fe2O3 structure. For mole fractions between x = 0.4 and 0.70, the Mössbauer spectra were considered as the superposition of a sextet and quadrupole doublet(s). In this concentration range the samples showed an almost constant value of hyperfine magnetic field. For x = 0.90 and 0.93, the Mössbauer spectra were considered as a superposition of two quadrupole doublets, whereas for x = 0.95 the superposition of two quadrupole doublets and one singlet was considered. The origin of this singlet with the isomer shift close to zero is not clearly understood. FE-SEM showed a strong sintering effect on the particles in all samples in the α-(AlxFe1-x)2O3 system.

Ključne riječi
solid solutions; α-Fe2O3; α-Al2O3; XRD; 57Fe Mössbauer; FE-SEM; EDS

Hrčak ID: 39657

URI
https://hrcak.srce.hr/39657

Posjeta: 848 *