%0 Journal article
%A Wang, Lin
%A Liu, Zhaodong
%A Koizumi, Sanae
%A Ballaran, Tiziana Boffa
%A Katsura, Tomoo
%T Aluminum Components in Bridgmanite Coexisting With Corundum and the CF‐Phase With Temperature
%R 10.1029/2022JB025739
%J Journal of Geophysical Research: Solid Earth
%V 128
%N 1

%I 
%X Abstract Phase relations in the MgSiO<sub>3</sub>–MgAl<sub>2</sub>O<sub>4</sub>–Al<sub>2</sub>O<sub>3</sub> system are investigated at 27 GPa and 2000–2600 K using a multi‐anvil apparatus. The AlAlO<sub>3</sub> content in the bridgmanite increases from 8.6 to 20.0 mol% with increasing temperature from 2000 to 2600 K, while the MgAlO<sub>2.5</sub> content remains nearly constant, that is, 3–4 mol% at these temperatures. Therefore, the presence of an additional Al‐bearing phase suppresses the oxygen vacancy substitution for Al<sup>3+</sup> in bridgmanite. Conversely, significant amounts of the Al<sub>8/3</sub>O<sub>4</sub> component can be dissolved into the calcium‐ferrite type MgAl<sub>2</sub>O<sub>4</sub>–Mg<sub>2</sub>SiO<sub>4</sub>–Al<sub>8/3</sub>O<sub>4</sub> phase (CF‐phase), implying that the CF‐phase likely contains some amount of vacancies. Therefore, the CF‐phase could also be a candidate mineral for transporting volatiles into the lower mantle. Our results, combined with previous studies on Al‐bearing bridgmanite, indicate that, once the Al per formula unit exceeds 0.12 in bridgmanite, the MgAlO<sub>2.5</sub> content remains nearly constant and the AlAlO<sub>3</sub> component becomes dominant.
%U http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11126
%~  FID GEO-LEO e-docs