Phase transition in CaSiO3 perovskite

Details Phase transition in CaSiO3 perovskite Phase transition in CaSiO3 perovskite

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.260..564k&link_type=abstract

Earth and Planetary Science Letters, Volume 260, Issue 3-4, p. 564-569.

Physics

9

Scientific paper

A phase transition in pure CaSiO3 perovskite was investigated at 27 to 72 GPa and 300 to 819 K by in-situ X-ray diffraction experiments in an externally-heated diamond-anvil cell. The results show that CaSiO3 perovskite takes a tetragonal form at 300 K and undergoes phase transition to a cubic structure above 490 580 K in a pressure range studied here. The transition boundary is strongly temperature-dependent with a slightly positive dT / dP slope of 1.1 (± 1.3) K/GPa. It is known that the transition temperature depends on Al2O3 content dissolved in CaSiO3 perovskite [Kurashina et al., Phys. Earth Planet. Inter. 145 (2004) 67 74]. The phase transition in CaSiO3(+ 3 wt.% Al2O3) perovskite therefore could occur in a cold subducted mid-oceanic ridge basalt (MORB) crust at about 1200 K in the upper- to mid-lower mantle. This phase transition is possibly ferroelastic-type and may cause large seismic anomalies in a wide depth range.

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