Liu, YunWithers, RaymondFitz Gerald, John2015-12-132015-12-130022-4596http://hdl.handle.net/1885/85771A careful TEM and XRD study of the (Ba1-xLax) 2In2O5+x, 0≤x≤0.6, 'defect-perovskite'- type solid solution has been carried out. A well-defined structural phase transition is shown to occur between x=0.1 and 0.2 from the orthorhombic brownmillerite strKeywords: Electric conductivity; Phase transitions; Reflection; Scattering; Transmission electron microscopy; X ray diffraction analysis; Braggs reflection; Valancy ordering; Barium compounds; barium; indium; lanthanum; oxygen; perovskite; article; association; cor (Ba1-xLax)2In2O5+x; Defect perovskite solid solution; Oxygen vacancy ordering; Phase transition; Structured diffuse scattering; TEM study200310.1016/S0022-4596(02)00115-92015-12-12