Infrared spectrum and structural role of titanium in synthetic Ti-garnets |
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| Authors: | P Tarte R Cahay A Garcia |
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| Institution: | 1. Institute of Chemistry, University of Liège, Sart Tilman par, B-4000, Liege 1, Belgium
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| Abstract: | Ti-spessartite, Ti-andradite and its indium homolog, Ca3In2(Si, Ti)3O12, have been synthesized and investigated by infrared (ir) spectroscopy. The use of isotopic species (46Ti-50Ti) gives the unequivocal proof that some of the additional bands observed in the 800–600 cm?1 region are due to TiO4 tetrahedra. For Si-Ti replacements up to 10 mol%, the localization of Ti on the available tetrahedral sites depends on the nature of the cations. For the In garnet all (or nearly all) Ti is located on tetrahedral sites; in Ti-andradite Ti is distributed over tetrahedral and octahedral sites, tetrahedral sites being thus occupied, in part by Ti (ir band near 700 cm?1) and in part by Fe (ir band near 650 cm?1); and Ti-spessartite the presence of Ti on tetrahedral sites is doubtful, these sites being essentially occupied by Al. |
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