Layered Perovskitic Structures in Pure and Doped LaTiO3.5-x and SrNbO3.5-x

Abstract The effect of careful control over metal and oxygen stoichiometry on the structures of various M n +1 M' n +1 O 3 n +5 phases ( M = La and/or Sr, M' = Ti and/or Nb) has been studied by transmission electron microscopy. In addition to the previously reported n = 3 and 4 layered phases and the n = ∝ parent perovskite, ordered and disordered intergrowth structures comprising the n = 2, 3, 4, and ∝ members have been characterized. The effects of in situ reduction in the electron microscope were studied.