Abstract
The space group of and its variation with temperature was analyzed by selected area electron diffraction (SAED) and by convergent‐beam electron diffraction (CBED). All the reflection spots of SAED patterns of at room temperature could be indexed as orthorhombic symmetry with primitive lattice of a = 5.479, b = 5.516, and c = 7.766 Å. The space group of at room temperature was determined to be Pbnm (no. 62) from the analysis of CBED patterns. The reflection spots of SAED patterns which indicated orthorhombic symmetry disappeared with increase in temperature up to 300°C. From CBED patterns, it was clarified that the crystal system of at 300°C was rhombohedral with space group of Rc (no. 167). © 2000 The Electrochemical Society. All rights reserved.
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