High-resolution x-ray powder diffraction studies of some Mg- and Si-substituted brownmillerites

A C Lewis, J K Cockroft, P Barnes, C Hall, R J Cernik, C C Tang, H Pollmann

    Research output: Contribution to journalArticlepeer-review


    Structure refinements from powder diffraction data are presented for Ca2Fe1.4Mg0.3Si0.3O5 (I) and Ca2Fe1.07Al0.67Mg0.13Si0.13O5 (II). I has space group Pcmn, a 5.5961(1), b 14.7766(3), c 5.4273(1) Å, Rwp = 12.5%, Rexp = 5.6%, RI = 8.7%; II has space group Ibm2, a 5.5815, b 14.5848(4), c 5.3711(1) Å, Rwp = 13.2%, Rexp = 6.7%, RI = 9.3%;. Although the site occupancies were not successfully detd. for the latter, results confirm the anion-deficient perovskite structure for both compds. [on SciFinder(R)]
    Original languageEnglish
    Pages (from-to)759-763
    Number of pages5
    JournalMater. Sci. Forum
    Issue numberPt. 2, European Powder Diffraction: EPDIC IV, Pt. 2
    Publication statusPublished - 1996


    • Crystal structure (of Mg- and Si-substituted brownmillerites)
    • crystal structure calcium magnesium silicon ferrate
    • aluminum calcium magnesium silicon ferrate structure
    • brownmillerite magnesium silicon substitution crystal structure


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