TRANSFORMATION IN GARNET FROM ORTHORHOMBIC PEROVSKITE TO LINBO3 PHASEON RELEASE OF PRESSURE

Authors
FUNAMORI N YAGI T MIYAJIMA N FUJINO K
Citation
N. Funamori et al., TRANSFORMATION IN GARNET FROM ORTHORHOMBIC PEROVSKITE TO LINBO3 PHASEON RELEASE OF PRESSURE, Science, 275(5299), 1997, pp. 513-515
Citations number
24
Categorie Soggetti
Multidisciplinary Sciences
Journal title
Science → ACNP
ISSN journal
00368075
Volume
275
Issue
5299
Year of publication
1997
Pages
513 - 515
Database
ISI
SICI code
0036-8075(1997)275:5299<513:TIGFOP>2.0.ZU;2-6
Abstract
High-pressure in situ x-ray diffraction and transmission electron micr oscopy on quenched samples show that natural garnet transforms to orth orhombic perovskite (and minor coexisting phases) containing increasin g amounts of aluminum with increasing pressure. This suggests that the perovskite is the dominant host mineral for aluminum in Earth's lower mantle. Orthorhombic perovskite is quenched from similar to 35 gigapa scals but, because of the increased aluminum content, transforms to th e LiNbO3 structure upon quenching from similar to 60 gigapascals.