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A SAED and HREM study of structural defects in brownmillerite, LaBa(x)Sr(1-x)CuGaOy related oxides
Maria Luisa Ruiz-González1, José M González-Calbet
1Departamento Química Inorgánica, Facultad de Químicas, Universidad Complutense, Madrid, Spain.
Journal of Electron Microscopy
|May 11, 2002
Abstract:
The synthesis and microstructural characterization, by means of selected area electron diffraction (SAED) and high resolution electron microscopy (HREM), of the solid solution LaBa(x)Sr(1-x)CuGaO5 (0.1 < or = 5 x < or = 0.9) is reported. Although an average brownmillerite Ima2 structure is proposed for the whole compositional range, SAED and HREM clearly show that structural defects appear as barium content increases.