ELECTRON-MICROSCOPIC STUDY OF A NEWLY FORMED EU2MNZRO7-DELTA WITH A FLUORITE-RELATED TYPE-STRUCTURE

A ternary compound, Eu2MnZrO7-delta was synthesized in a reducing atmo sphere at 1623 K. The compound has the basic cell of the fluorite type . Electron diffraction patterns consisted of the diffuse reflections i n addition to the fundamental reflections. In the dark-field image, th e existence of microdomains with different orientations was observed. Each domain has a modulation along the [111]() of the basic cell with a sequence of the 1/2(111)(). It is suggested that the divalent mang nese ions, Mn2+, were formed in the reducing atmosphere, which resulte d in the formation of the fluorite-type compound. (C) 1997 Elsevier Sc ience Ltd.