The temperature dependence of relat

The temperature dependence of relative dielectric constants and dielectric loss of the KNN ceramics are shown in Fig. 8(c) and (d), and the results indicate that both of the CSAS and CS samples exhibited relatively high curie temperatures (Tc) and orthorhombic-tetragonal transition temperature (To-t). The (To-t, Tc) of the CSAS and CS produced ceramics sintered at 1115°C are (213°C, 411°C) and (205°C, 409°C), respectively. The slightly shift of To-t maybe caused by the fact that the loss of A-site elements in CSAS is less than CS samples. It should be noted that the CSAS produced ceramics maintains higher dielectric constant and lower loss from room temperature to 500°C, and the highest value of dielectric constant is close to 11000 (over 70% higher than the maximal value for CS samples), indicating that CSAS produced KNN ceramics possess excellent dielectric properties.