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Della Giusta, Antonio, Carbonin, Susanna, Ottonello, Giulio (1996) Temperature-dependent disorder in a natural Mg-Al-Fe2+-Fe3+-Spinel. Mineralogical Magazine, 60 (401) 603-616 doi:10.1180/minmag.1996.060.401.06

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Reference TypeJournal (article/letter/editorial)
TitleTemperature-dependent disorder in a natural Mg-Al-Fe2+-Fe3+-Spinel
JournalMineralogical MagazineISSN0026-461X
AuthorsDella Giusta, AntonioAuthor
Carbonin, SusannaAuthor
Ottonello, GiulioAuthor
Year1996 (August)Volume60
Issue401
PublisherMineralogical Society
Download URLhttps://rruff.info/doclib/MinMag/Volume_60/60-401-603.pdf+
DOIdoi:10.1180/minmag.1996.060.401.06Search in ResearchGate
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Mindat Ref. ID69Long-form Identifiermindat:1:5:69:1
GUID0
Full ReferenceDella Giusta, Antonio, Carbonin, Susanna, Ottonello, Giulio (1996) Temperature-dependent disorder in a natural Mg-Al-Fe2+-Fe3+-Spinel. Mineralogical Magazine, 60 (401) 603-616 doi:10.1180/minmag.1996.060.401.06
Plain TextDella Giusta, Antonio, Carbonin, Susanna, Ottonello, Giulio (1996) Temperature-dependent disorder in a natural Mg-Al-Fe2+-Fe3+-Spinel. Mineralogical Magazine, 60 (401) 603-616 doi:10.1180/minmag.1996.060.401.06
In(1996, August) Mineralogical Magazine Vol. 60 (401) Mineralogical Society
Abstract/NotesAbstractA natural Mg-Al-Fe spinel from the Balmuccia peridotite (Italian Western Alps) was annealed at T between 650 and 1150°C, under controlled oxygen activity, and quenched in H2O. Twenty-three cation distributions were calculated from XRD structural refinements in tandem with microprobe analysis, and verified by Mössbauer spectroscopy in the case of unheated samples.Unheated crystals showed essentially ordered distribution of Fe3+ in octahedral and Fe2+ in tetrahedral sites, the only intracrystalline disorder being represented by ∼0.12 atoms per formula unit of [4]Al and [6]Mg. Thermal runs and quenching maintained substantially ordered distribution of Fe2+ and Fe3+ up to ∼990°C and produced continuous [4]Mg-[6]Al exchange. Between 990 and 1150°C, the previous order of Fe2+-Fe3+ appeared to change slightly, [6]Fe2+ reaching ∼0.04 afu and [6]Mg ≅ [4]Al ≅ 0.24 afu at the highest T. After quenching from this temperature, Fe2+ still resided mainly in the T site. Some previously heated crystals underwent reordering on lowering of the temperature.Experimental data, integrated with existing literature, enabled cation-oxygen distance in this structure to be improved. Results from annealed samples allowed the formulation of an experimental thermometric function based on Mg-Al intracrystalline disorder.

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Menegazzo, Giorgio, Carbonin, Susanna, Giusta, Antonio Della (1997) Cation and vacancy distribution in an artificially oxidized natural spinel. Mineralogical Magazine, 61 (406) 411-421 doi:10.1180/minmag.1997.061.406.07
Carbonin, Susanna, Russo, Umberto, Della Giusta, Antonio (1996) Cation distribution in some natural spinels from X-ray diffraction and Mössbauer spectroscopy. Mineralogical Magazine, 60 (399) 355-368 doi:10.1180/minmag.1996.060.399.10
Della Giusta, Antonio, Ottonello, Giulio (1994) Energy and long-range disorder in simple spinels. Physics and Chemistry of Minerals, 20 (8) 626 doi:10.1007/bf00211859
Della Giusta, Antonio, Ottonello, Giulio (1993) Energy and long-range disorder in simple spinels. Physics and Chemistry of Minerals, 20 (4). 228-241 doi:10.1007/bf00208136
(1996) 1995 Mineralogical Society-Schlumberger Award. Mineralogical Magazine, 60 (401) 687-690 doi:10.1180/minmag.1996.060.401.19
Rossetti, P., Gatta, G. D., Diella, V., Carbonin, S., Della Giusta, A., Ferrario, A. (2009) The magnetite ore districts of the southern Aosta Valley (Western Alps, Italy): a mineralogical study of metasomatized chromite ore. Mineralogical Magazine, 73 (5) 737-751 doi:10.1180/minmag.2009.073.5.737
(1996) 1995 Max Hey Medal. Mineralogical Magazine, 60 (401) 690-692 doi:10.1180/minmag.1996.060.401.20
Princivalle, F., Della Giusta, A., De Min, A, Piccirillo, E. M. (1999) Crystal chemistry and significance of cation ordering in Mg-Al rich spinels from high-grade hornfels (Predazzo-Monzoni, NE Italy) Mineralogical Magazine, 63 (2) 257-262 doi:10.1180/minmag.1999.063.2.11
Della Giusta, A., Princivalle, F., Carbonin, Susanna (1987) Crystal structure and cation distribution in some natural magnetites. Mineralogy and Petrology, 37 (3) 315-321 doi:10.1007/bf01161823
Martignago, F., Negro, A. Dal, Carbonin, S. (2003) How Cr3+ and Fe3+ affect Mg?Al order?disorder transformation at high temperature in natural spinels. Physics and Chemistry of Minerals, 30 (7) 401-408 doi:10.1007/s00269-003-0336-0
Ottonello, G., Princivalle, F., Della Giusta, A. (1990) Temperature, composition, and fO2 effects on intersite distribution of Mg and Fe2+ in olivines. Physics and Chemistry of Minerals, 17 (4). 301-312 doi:10.1007/bf00200125
 
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