Citation: Vanpeteghem, C. B.; Angel, R. J.; Zhao, J.; Ross, N. L.; Redhammer, G. J.; Seifert, F. (2008). The effect of oxygen vacancies and aluminium substitution on the high-pressure properties of brownmillerite-structured Ca2Fe2-xAlxO5 Note: x = 0.55 Note: P = 3.21 GPa. Physics and Chemistry of Minerals, 35, pp. 493-504.