Topotactic dehydration of HLnTiO4 (Ln = La, Nd, Sm or Gd) around 480–500 °C yields a new series of metastable layered perovskite oxides, Ln2□Ti2O7, that possess a defective Sr3Ti2O7 structure, where the cubooctahedral sites within the double-perovskite layers are most likely vacant.
V. Thangadurai, J. Gopalakrishnan and G. N. Subbanna, Chem. Commun., 1998, 1299 DOI: 10.1039/A802644K
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