Composition dependence of phase structure and electrical properties in lead-free (1-x)(K0.42Na0.585)(Nb1−Sb )O3-xBi0.5K0.5ZrO3 piezoceramics

Co-Doping Effect of BiGaO3 and (Bi,Na,K,Li)ZrO3 on Multi-Phase Structure and Piezoelectric Properties of (K,Na)NbO3 Lead-Free Ceramics

“…The origin of this sudden decrease in grain size is attributed to the effects of the solubility limits of low-melting-point Bi 3+ ion or BiMO 3 dopant in KNN and aggregation at grain boundaries. The grain size behavior observed in this work, including a dramatic decrease in grain size, was consistent with those reported in previous studies [23][24][25][26][27]. The only notable difference was that the BG doping induced more compositional sensitivity (i.e., 0.001 mole fraction level) to the grain structure evolution, which is likely owing to the effects of the super-tetragonal structure of BG [17].…”

“…Those behaviors were commonly observed for two BNKLZ compositions. For the KNN-based ceramics doped with Bi-containing perovskite oxides, it has been generally shown that the grain size dramatically decreased owing to a slight increase (usually by about 0.01 mole fraction) of the amount of dopants at certain doping levels [23][24][25][26][27]. The origin of this sudden decrease in grain size is attributed to the effects of the solubility limits of low-melting-point Bi 3+ ion or BiMO 3 dopant in KNN and aggregation at grain boundaries.…”

Composition design, electrical properties, and temperature stability in (1 − x)K0.44Na0.56Nb0.96Sb0.04O3-xBi0.45La0.05Na0.5ZrO3 lead-free ceramics

“…[4][5][6][7] According to the previous works, Sb 5+ , Bi 0.5 M 0.5 ZrO 3 (M ¼ Na, K, Li, Ag), can effectively enhance electrical properties of KNN ceramics by constructing the multiphase boundary. [3][4][5][6][7][8]10,[14][15][16] Therefore, these additives are good candidates for constructing phase boundary to improve the electricity (especially the piezoelectric properties) in KNNbased ceramics.…”

Piezoelectric Voltage Constant and Sensitivity Enhancements Through Phase Boundary Structure Control of Lead-free (K,Na)NbO3-based ceramics

“…With the further increase in y, the size of the large grains dramatically decreased owing to the effect of the solubility limits of low-melting-point Bi 3+ ion or its oxides in KNN lattice. The observed structural evolution was typical of many KNN-based ceramics doped with Bi-containing perovskite oxides [30][31][32][33]. Regarding the d 33 behavior shown in Fig.…”