Abstract
Ca1-xLaxCu3Ti4O12 (x=0-0.05) ceramics are prepared by the solid-state reaction method. The effects of La doping on the microstructure and non-Ohmic properties of Ca1-xLaxCu3Ti4O12 system are investigated by XRD, SEM and Positron annihilation technique. The results show that no phase transition occurs in the doping range (x=0-0.05), while the significant changes in grain size can be observed as x≥0.02. The positron lifetime results prove that the average lifetime is strongly affected by La doping. The correlation of the nonlinear behavior of CaCu3Ti4O12 system and the grain size, the local electron density in defect was discussed.
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