Bi5Ti3FeO15 and Bi7Ti3Fe3O21 which are n=4 and n=6 members of the family of oxides of the general formula (Bi2O2)2+(An−1BnO3n+1)2− show unusual superstructures, possibly due to cation ordering.
Rana Saha, Ajmala Shireen, A. K. Bera, Sharmila N. Shirodkar, Y. Sundarayya, Nandakumar Kalarikkal, S. M. Yusuf, Umesh V. Waghmare, A. Sundaresan, Cnr Rao
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