Abstract
Li and Te doping at the B and B’ sites of SrLaLi1-xTe1+xO6 and its effect on the structure and band gap were investigated for the first time for −0.2 ≤ x ≤ 0.2. All the samples were found to be crystallized in the monoclinic structure with space group P21/n thereby suggesting the formation of a double perovskite. The cell volume is seen to vary almost linearly for all compositions authenticating the formation of single-phase. A deviation from pseudo-cubic symmetry is observed from Li rich to Te rich compositions in terms of the monoclinic cell angle. A linear variation in the tolerance factor suggests that the doping of Te for Li permits for a better matching of the Sr/La-O and Li/Te-O bond distances as compared to Li for Te doping. Optical band gap measurements indicate a reduction in the width of the conduction band causing a rise in the energy Eg.
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