Abstract
BaAl12O19 has the structure of the mineral magnetoplumbite1. In the hexagonal unit cell, containing two formula units, the aluminium ions are distributed among five crystallographic positions. There are two tetrahedrally co-ordinated positions (4f in C6/mmm) nine octahedrally co-ordinated (2a, 12k, 4f) and one ion surrounded by a trigonal bipyramid (2b in C6/mmm) of oxide ions per formula unit.
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BANKS, E., ROBBINS, M. Fluoride-compensated Substitution of Bivalent Cations in the Magnetoplumbite Structure. Nature 191, 1387–1388 (1961). https://doi.org/10.1038/1911387b0
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DOI: https://doi.org/10.1038/1911387b0
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