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Metamictization and recrystallization of titanite: An infrared spectroscopic study
-
Ming Zhang
,
Ekhard K.H. Salje
Published/Copyright:
March 28, 2015
Abstract
Radiation damage and the recrystallization of natural titanite (CaTiSiO5) were studied using infrared spectroscopy in the spectral range from 50 to 7500 cm-1. The results show that radiation damage leads to systematic changes in spectral features: decreasing absorption and reflectivity, line broadening, and loss of orientational dependence. Strongly damaged titanite shows hydroxylate bands between 2200 and 3500 cm-1. The band most affected by radiation damage is the Ti-O stretching band near 670 cm-1. It shifts to 710 cm-1 in the most damaged samples, possibly indicating the presence of TiO5 complexes in metamict titanite. Titanite glasses (quenched melts of CaTiSiO5) show spectral features different from those of radiation-damaged titanite, especially in the Ti-O and Si-O stretching regions.
Annealing radiation-damaged titanites at high temperatures results in the recovery of damaged crystalline regions. Recrystallization near 900 K is characterized by an increase in reflectivity, integrated absorbance, and line sharpening. Different infrared bands show recovery at different temperatures. The restoration of the Ti-O stretching band near 670 cm-1 and an infrared band near 285 cm-1 took place at temperatures of 1200-1400 K. Temperature-induced changes of the OH-absorption bands could be responsible for the previously reported differences in the temperature evolution of infrared spectra of OH species between in situ and quench experiments
Received: 2001-9-19
Accepted: 2002-1-29
Published Online: 2015-3-28
Published in Print: 2002-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
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- Determination of molar absorptivities for infrared absorption bands of H2O in andesitic glasses
- H2O activity in H2O-N2 fluids at high pressure and temperature measured by the brucitepericlase equilibrium
- Kinetics of iron oxidation-reduction in hydrous silicic melts
- Kinetics of cation ordering in synthetic MgAl2O4 spinel
- Structural properties and heat-induced oxidation-dehydrogenation of manganoan ilvaite from Perda Niedda mine, Sardinia, Italy
- Ultrahigh-pressure metamorphism in western Tianshan, China: Part I. Evidence from inclusions of coesite pseudomorphs in garnet and from quartz exsolution lamellae in omphacite in eclogites
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- Ferripedrizite, a new monoclinic BLi amphibole end-member from the Eastern Pedriza Massif, Sierra de Guadarrama, Spain, and a restatement of the nomenclature of Mg-Fe-Mn-Li amphiboles
- Description and crystal structure of vajdakite, [(Mo6+O2)2(H2O)2 As3+ 2O5]·H2O—A new mineral from Jáchymov, Czech Republic
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