COMPOSITIONAL DEPENDENCE OF CATION DISTRIBUTION IN SOME SYNTHETIC (MG,ZN) (AL,FE3+)2O4 SPINELS
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dc.contributor.author | Andreozzi G.B. | |
dc.contributor.author | Lucchesi S. | |
dc.contributor.author | Skogby H. | |
dc.contributor.author | Della Giusta A. | |
dc.date.accessioned | 2021-04-09T02:56:42Z | |
dc.date.available | 2021-04-09T02:56:42Z | |
dc.date.issued | 2001 | |
dc.identifier | https://www.elibrary.ru/item.asp?id=32118329 | |
dc.identifier.citation | European Journal of Mineralogy, 2001, 13, 2, 391-402 | |
dc.identifier.issn | 0935-1221 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/27590 | |
dc.description.abstract | The compositional dependence of the intracrystalline cation distribution was investigated in four synthetic spinels belonging to binary solid solutions. Spinel single crystals were flux-grown in the (Mg,Zn)(Al,Fe3+)(2)O-4 system, and cation distribution was determined by means of single-crystal X-ray structural refinement, electron-microprobe analysis and Mossbauer spectroscopy. Experimental data were processed and a detailed topochemical model was obtained for each sample: (IV)(Mg0.76Al0.24)(VI)(Al1.76Mg0.24)O-4; (IV)(Zn0.65Mg0.22 Al-0.13)(VI)(Al1.87Mg0.13)O-4; (IV)(Mg0.73Al0.18Fe0.093+)(VI)(Al1.62Mg0.27Fe0.113+)O-4 and (IV)(Mg0.62Zn0.15Al0.15Fe0.083+) (VI)(Al1.61Mg0.23Fe0.163+)O-4. Zinc was found to occupy only the tetrahedrally coordinated site and its presence strongly influenced intersite cation partitioning. In Zn-bearing crystals both intracrystalline exchanges Mg <--> Al and Mg <--> Fe3+ turned out to be limited. Zinc in octahedral coordination, which is rare in natural spinels, was shown to be favoured by high Fe3+ contents and high equilibration temperatures. The cation distributions determined experimentally were found to be in close agreement with those calculated-using the general thermodynamic model for spinel solid solutions by O'Neill & Navrotsky (1984). | |
dc.title | COMPOSITIONAL DEPENDENCE OF CATION DISTRIBUTION IN SOME SYNTHETIC (MG,ZN) (AL,FE3+)2O4 SPINELS | |
dc.type | Статья |
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