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000192654 1001_ $$0P:(DE-H253)PIP1011899$$aBeirau, T.$$b0$$eCorresponding Author
000192654 245__ $$aTemperature-induced P21/c to C2/c phase transition in partially amorphous (METAMICT) titanite revealed by Raman spectroscopy
000192654 260__ $$aOttawa$$bAssoc.$$c2014
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000192654 500__ $$a(c) Mineralogical Association of Canada. Post referee fulltext in progress.
000192654 520__ $$aIn situ temperature-dependent Raman spectroscopic measurements of two partially amorphous (metamict) titanite samples with accumulated radiation doses ~1.2 × 1018 α-events/g (E2335) and ~2.2 ×1018 α-events/g (M28696) and amorphous fractions of 0.24 and 0.5, respectively, provide evidence for a thermally induced transformation analogous to the phase transition P21/c ↔ C2/c, which is characteristic of endmember titanite (CaTiSiO5). Quantitative analysis of the temperature evolution of the wavenumbers and widths of Raman-active vibrations in both partially amorphous titanites reveals an anomaly near 500 K which is consistent with the P21/c ↔ C2/c phase-transition temperature of titanite close to its endmember composition. The observed spectral changes are not due to structural recovery of the radiation-damaged structure because synchrotron X-ray diffraction experiments of M28696 titanite show that relevant recrystallization occurs at annealing temperatures above 600 K. The structural transformation near 500 K is observed by Raman spectroscopy even in heavily radiation-damaged and chemically inhomogeneous titanite (M28696). The microstructure of the samples consists of coexisting crystalline and amorphous domains, with the P21/c to C2/c phase-transition occurring in the latter.
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000192654 7001_ $$0P:(DE-H253)PIP1008400$$aMihailova, B.$$b1
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000192654 7001_ $$0P:(DE-H253)PIP1008296$$aBismayer, U.$$b4
000192654 7001_ $$0P:(DE-HGF)0$$aGroat, L. A.$$b5
000192654 773__ $$0PERI:(DE-600)2046640-7$$a10.3749/canmin.52.1.91$$gVol. 52, no. 1, p. 91 - 100$$n1$$p91 - 100$$tThe @Canadian mineralogist$$v52$$x1499-1276$$y2014
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