Effect of microstructure on the dielectric properties of (1−x)Na0.5K0.5NbO3–xSrTiO3 ceramics

Relaxor Behavior of Lead-Free Nonstoichiometric (Na0.48-xK0.48-xLi0.04)Nb0.89-xTa0.05Sb0.06O3-xSrTiO3Ceramics

“…The distortion, in turn, results in a local charge imbalance, and finally causes the formation of local electric fields. 29 The increased spontaneous polarization of the PNRs is due to the different valences and ionic radii of the compositional cations, as well as the existence of local strain arising in the perovskite structure. The presence of PNRs initially appeared in the phase at T B as a result of local phase transitions.…”

Effects of CuO Sintering Aids on Microstructure and Electric Properties for (Na0.48K0.473Li0.04Sr0.007) (Nb0.883Ta0.05Sb0.06Ti0.007)O3 Ceramics

“…The results represent that the dielectric behavior of NKLNTS-ST-xCuO ceramics exhibit more diffused phase transition behavior as increasing the amounts of CuO additives. According to the discussions of XRD patterns, SEM images and densities, the response mechanism is suggested that the Cu 2+ ions dissolve into the A-site and B-site and then promote more ion or oxygen vacancies, more compositional fluctuation and more local distortion [35].…”