Dielectric performance and conductive mechanism of KNN-based ceramics prepared via sol–gel core–shell process

(Bi0.5Na0.5)(Zr0.97W0.01Fe0.02)O3 doping effects on KNN‐based lead‐free ceramics prepared via two‐step sintering technique

“…As shown in Figure S6, the dielectric response characteristic of all LNKNbS‐xBiNZWF ceramics can be fitted by two laws but all have some deviation, based on which important fitting data are given in Table 2. All ceramics have the Curie‐Weiss constant C of 10 5 magnitude as shown in the fitting results, indicating that the ferroelectric‐paraelectric phase transition is not an order‐disorder phase transition, but is a displacive phase transition 44 . All the diffusive coefficient γ obtained by the exponential law fitting is larger than 1.6 but less than 2, indicating that all ceramics exhibit the characteristic of diffusive phase transition, but are not typical relaxor ferroelectrics 45 .…”

“…All ceramics have the Curie-Weiss constant C of 10 5 magnitude as shown in the fitting results, indicating that the ferroelectric-paraelectric phase transition is not an order-disorder phase transition, but is a displacive phase transition. 44 All the diffusive coefficient γ obtained by the exponential law fitting is larger than 1.6 but less than 2, indicating that all ceramics exhibit the characteristic of diffusive phase transition, but are not typical relaxor ferroelectrics. 45 With the increase of the BiNZWF amount, the γ value presents bimodal change characteristic, and a maximum γ value of 1.808 is obtained when x = 0.04, showing the strongest relaxation degree.…”

0.90(0.88NaNbO3-0.12Bi(Ni0.5Zr0.5)O3)-0.10CaTiO3 Lead-Free Dielectric Ceramics with High Energy Storage Properties

“…In this experiment, since the Z′−Z″ diagrams in the diagram are approximately semicircular, a group of RQC (R is resistance, Q is constant phase element, C is capacitance) equivalent circuits are selected for resistance fitting analysis. 39,40 The schematic diagram of the RQC circuit and the fitting results of the resistance values of each component are shown in Figure 6a−d.…”

“…In order to study the effect of doping CT on the resistance and activation energy of the samples, we carried out impedance tests for (1- x )­(0.88NN-0.12BNZ)- x CT samples. In this experiment, since the Z′–Z″ diagrams in the diagram are approximately semicircular, a group of RQC (R is resistance, Q is constant phase element, C is capacitance) equivalent circuits are selected for resistance fitting analysis. , The schematic diagram of the RQC circuit and the fitting results of the resistance values of each component are shown in Figure a–d.…”