Ba2 Fe8 O14 structure

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
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