Skiagite-rich garnet was synthesized as single crystals at 9.5 GPa and 1100 °C using a multi-anvil apparatus. The crystal structure [cubic, space group Ia3d, a = 11.7511(2) Å, V = 1622.69(5) Å3, Dcalc = 4.4931 g/cm3] was investigated using single-crystal synchrotron X-ray diffraction. Synchrotron Mössbauer source spectroscopy revealed that Fe2+ and Fe3+ predominantly occupy dodecahedral (X) and octahedral (Y) sites, respectively, as expected for the garnet structure, and confirmed independently using nuclear forward scattering. Single-crystal X-ray diffraction suggests the structural formula of the skiagite-rich garnet to be Fe32+(Fe2+0.234(2)Fe3+1.532(1)Si4+0.234(2))(SiO4)3, in agreement with electron microprobe chemical analysis. The formula is consistent with X-ray absorption near-edge structure spectra. The occurrence of Si and Fe2+ in the octahedral Y-site indicates the synthesized garnet to be a solid solution of end-member skiagite with ∼23 mol% of the Fe-majorite end-member Fe32+(Fe2+Si4+)(SiO4)3.

Ismailova, L., Bobrov, A., Bykov, M., Bykova, E., Cerantola, V., Kantor, I., et al. (2015). High-pressure synthesis of skiagite-majorite garnet and investigation of its crystal structure. AMERICAN MINERALOGIST, 100(11-12), 2650-2654 [10.2138/am-2015-5278].

High-pressure synthesis of skiagite-majorite garnet and investigation of its crystal structure

Cerantola V;
2015

Abstract

Skiagite-rich garnet was synthesized as single crystals at 9.5 GPa and 1100 °C using a multi-anvil apparatus. The crystal structure [cubic, space group Ia3d, a = 11.7511(2) Å, V = 1622.69(5) Å3, Dcalc = 4.4931 g/cm3] was investigated using single-crystal synchrotron X-ray diffraction. Synchrotron Mössbauer source spectroscopy revealed that Fe2+ and Fe3+ predominantly occupy dodecahedral (X) and octahedral (Y) sites, respectively, as expected for the garnet structure, and confirmed independently using nuclear forward scattering. Single-crystal X-ray diffraction suggests the structural formula of the skiagite-rich garnet to be Fe32+(Fe2+0.234(2)Fe3+1.532(1)Si4+0.234(2))(SiO4)3, in agreement with electron microprobe chemical analysis. The formula is consistent with X-ray absorption near-edge structure spectra. The occurrence of Si and Fe2+ in the octahedral Y-site indicates the synthesized garnet to be a solid solution of end-member skiagite with ∼23 mol% of the Fe-majorite end-member Fe32+(Fe2+Si4+)(SiO4)3.
Articolo in rivista - Articolo scientifico
garnets; majorite; Mössbauer spectroscopy; nuclear forward scattering; single-crystal X-ray diffraction; Skiagite; XANES;
English
2650
2654
5
Ismailova, L., Bobrov, A., Bykov, M., Bykova, E., Cerantola, V., Kantor, I., et al. (2015). High-pressure synthesis of skiagite-majorite garnet and investigation of its crystal structure. AMERICAN MINERALOGIST, 100(11-12), 2650-2654 [10.2138/am-2015-5278].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/397798
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