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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Tarte, P., Cahay, R. & Garcia, A. Infrared spectrum and structural role of titanium in synthetic Ti-garnets. Phys Chem Minerals 4, 55–63 (1979). https://doi.org/10.1007/BF00308359
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DOI: https://doi.org/10.1007/BF00308359