The role of SiO4 groups in a thermally annealed zircon has been investigated. The lattice parameters suggest that at 1,343 K recrystallized zircon is in the high temperature structural modification. The observed changes in the IR spectra of annealed zircon can be explained with a two stage process: (i) a relaxation of the tetrahedra as a function of time, indicating that in the metamict zircon there is a further deformation of the tetrahedra with respect to the one related to the high-temperature structural change and (ii) new absorption bands appear and they can be identified as cristobalite. This latter observation helps the modelling of the recrystallization process based upon diffusion rates.
Colombo, M., Crosch, J., Turbanti, I., Biagini, R. (1999). An IR analysis of the role of SiO4 tetrahedra in thermally annealed ZrSiO4. NEUES JAHRBUCH FUR MINERALOGIE MONATSHEFTE, 3, 113-122.
An IR analysis of the role of SiO4 tetrahedra in thermally annealed ZrSiO4
TURBANTI, I.;BIAGINI, R.
1999-01-01
Abstract
The role of SiO4 groups in a thermally annealed zircon has been investigated. The lattice parameters suggest that at 1,343 K recrystallized zircon is in the high temperature structural modification. The observed changes in the IR spectra of annealed zircon can be explained with a two stage process: (i) a relaxation of the tetrahedra as a function of time, indicating that in the metamict zircon there is a further deformation of the tetrahedra with respect to the one related to the high-temperature structural change and (ii) new absorption bands appear and they can be identified as cristobalite. This latter observation helps the modelling of the recrystallization process based upon diffusion rates.
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https://hdl.handle.net/11365/6765
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