A novel route to lower the dielectric loss in CaCu$_{3}$Ti$_{4}$O$_{12}$   ceramics
  Based upon a widely-accepted internal-barrier-layer-capacitance (IBLC) model, the dielectric loss in the giant-dielectric-constant CaCu$_{3}$Ti$_{4}$O$_{12}$ (CCTO) material is expected to decrease as the conductivity of the CCTO grains/subgrains increases. In this letter, we report that this idea was successfully realized through the La-for-Ca substitution in the CCTO ceramics. The impedance spectroscopy analysis gives the evidence. 
Lixin Feng, Xiaoming Tang, Yueyue Yan, Xuezhi Chen, Zhengkuan Jiao,   and Guanghan Cao