| Summary: | 碩士 === 大同大學 === 材料工程學系(所) === 102 === The ceramic electrolytes Li0.33La0.56-yNdyTiO3 (0 ≤ y ≤ 0.05) were synthesized via a sol-gel method to lower their calcination temperature for reducing the lithium loss due to gasification from the precursor powders. In order to improve ionic conductivity of Li0.33La0.56TiO3-based electrolyte, Nd3+ doping at A-sites of LLTO with various concentrations was used for distortion of the lattice in this study. The microstructures of the prepared samples were investigated by x-ray diffraction (XRD), and high resolve transmission electron microscopy (HR-TEM). After sintering at 1300 oC, samples with P4/mmm space group were prepared with furnace cooling, whereas samples with I4/mcm space group were obtained by quenching. From the results of electrochemical impedance spectroscopic study, the sample prepared with amount of Nd - doping of 0.6% mol exhibits the highest overall, grain, and grain boundary ionic conductivities among the in furnace-cooled samples sintered at 1300 oC. For quenched samples prepared at 1300 oC, the ionic conductivities decrease with increasing amount of Nd-doping.
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