Abstract
Based on X-ray powder diffraction data, the lattice structure and symmetry of La1-xTexMnO3 (0.04≤x≤0.2) have been analyzed by Rietveld refining method. the results show that all samples structure have a rhombohedral symmetry with space group R3C, and the lattice of MnO6 octahedron has a stretching distortion due to the difference in cation size. Besides, the degrec of structure distortion is closely related to Te content and can be depicted with the following three factors: the Mn—O—Mn bond angle θMn—O—Mn, the average A-site radius 〈rA〉 and the A-site sizemismatch σ2. According to the changing trend of these factors, several conjecture on physical properties are discussed, including the Curie temperature, spin-glass and phase separation etc.
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