AN IN-SITU X-RAY-DIFFRACTION STUDY OF THE ALPHA-BETA TRANSFORMATION KINETICS OF MG2SIO4

Citation
T. Kubo et al., AN IN-SITU X-RAY-DIFFRACTION STUDY OF THE ALPHA-BETA TRANSFORMATION KINETICS OF MG2SIO4, Geophysical research letters, 25(5), 1998, pp. 695-698
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary
ISSN journal
0094-8276
Volume
25
Issue
5
Year of publication
1998
Pages
695 - 698
Database
ISI
SICI code
0094-8276(1998)25:5<695:AIXSOT>2.0.ZU;2-S
Abstract
This is the first report of the direct measurement of alpha-beta trans formation kinetics in Mg2SiO4, a major constituent in the Earth's mant le, through in situ X ray diffraction experiments at high pressure. Th e experiments were conducted using the sintered diamond cubic-anvil ap paratus with synchrotron radiation (MAX 80). Although the present work is still preliminary, the kinetic data were analyzed using a nucleati on and growth model. The growth rate of beta-phase is determined to be 3.3 (1.6 similar to 4.9) x 10(-10) m/s at 13.0 GPa and 900 degrees C, 7.1 (3.4 similar to 10) x 10(-10) m/s at 14.1 GPa and 885 degrees C, and 1.5 (0.7 similar to 2.3) x 10(-9) m/s at 14.9 GPa and 875 degrees C.