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| Home > Publications database > Temperature-induced P21/c to C2/c phase transition in partially amorphous (METAMICT) titanite revealed by Raman spectroscopy > print |
| 001 | 192654 | ||
| 005 | 20250730144923.0 | ||
| 024 | 7 | _ | |a 10.3749/canmin.52.1.91 |2 doi |
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| 100 | 1 | _ | |a Beirau, T. |0 P:(DE-H253)PIP1011899 |b 0 |e Corresponding Author |
| 245 | _ | _ | |a Temperature-induced P21/c to C2/c phase transition in partially amorphous (METAMICT) titanite revealed by Raman spectroscopy |
| 260 | _ | _ | |a Ottawa |c 2014 |b Assoc. |
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| 500 | _ | _ | |a (c) Mineralogical Association of Canada. Post referee fulltext in progress. |
| 520 | _ | _ | |a In 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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| 773 | _ | _ | |a 10.3749/canmin.52.1.91 |g Vol. 52, no. 1, p. 91 - 100 |0 PERI:(DE-600)2046640-7 |n 1 |p 91 - 100 |t The @Canadian mineralogist |v 52 |y 2014 |x 1499-1276 |
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