Synthesis and structure of Bi2LaO4Cl: A novel variant of the sillen phases

Christopher J. Milne*, Philip Lightfoot, James D. Jorgensen, Simine Short

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)


A new series of layered oxyhalides, Bi2MO4Cl (M=La, Nd, Y), has been synthesized. Bi2LaO4Cl has been characterised by a combination of X-ray and neutron powder diffraction: space group P4/mmm, a=3.9547(1), c=9.1275(3) Å. The structure consists of alternating layers of 'triple fluorite', [M3O4] + and halide, Cl-. Within the fluorite layers there is perfect ordering of the cations, -Bi-O2-La-O2-Bi, such that La is coordinated only by oxide layers and Bi by both oxide and chloride layers. This phase represents the simplest example of an intergrowth structure containing the [M3O4] block layer, which is found in several of the copper oxide superconductors. The structure also suggests the existence of a new family of layered oxyhalides parallel with the well known Sillen phases, [M2O2]Xn, with triple [M 3O4] fluorite layers replacing the normal double [M 2O2] layers.

Original languageEnglish
Pages (from-to)1419-1421
Number of pages3
JournalJournal of Materials Chemistry
Issue number9
Publication statusPublished - 1 Jan 1995


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