Is somebody aware of structure of Ba2Fe8O14 with P-3m1 symmetry and c parameter about 9.6 A? It is mentioned in several papers as 'early published', however I found neither publication nor database record on it. One may be also expressed as BaO . 2Fe2O3 ferrite or pure 'T block' in terms of Braun's description.
Thank you for any advice!
== Ivan Orlov Swiss Federal Institute of Technology Lausanne, Switzerland