Piezoelectric and dielectric properties of 0.98(Na0.5K0.5)NbO3–0.02Ba(ZrxTi(1−x))O3 ceramics

Synthesis and Electrical Characterization of 0.8(K,Na)NbO₃-0.2(Ba,Ca)(Zr,Ti)O₃ Lead-Free Ceramics

“…The Curie temperature of 0.8KNN-0.2BCZT was higher than that resulted in previous researches. Several solid solution composition of K 0.5 Na 0.5 NbO 3 with Ba 0.8 Ca 0.2 ZrO 3 [6], BaZr 0.2 Ti 0.8 O 3 [7] or Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 [8] resulted in T c near 300-400°C. Cations composition of those materials was different, Ba has greater composition than Ca and Ti has greater composition than Zr.…”

“…Combining high Curie temperature with low dielectricity of KNN and low Curie temperature with high dielectricity of BCZT becomes an interesting investigation to open up new composition. Referring to previous works, composition of Ba 0.5 Ca 0.5 Zr 0.5 Ti 0.5 O 3 which is mixed with K 0.5 Na 0.5 NbO 3 has not worked out [6][7][8]. In this research, solid solution of niobate and titanate materials would be synthesized via solid state reaction.…”

Fabrication of Lead-Free Lithium-Doped Na0.5K0.5NbO3 Piezoelectric Ceramics with Dense Grain Structure Using Sol–Gel Surface Coating

“…Well-separated orthorhombic structures are obtained at high index perovskite XRD peaks. [8][9][10] Figure 3 shows the SEM images of the LNKN ceramics fabricated at different sintering temperatures. A distinct trend of the grain structure in the specimens according to the sintering temperature was observed.…”

“…In particular, (Na x K 1Àx )-NbO 3 (NKN)-based ceramics have been focused on as lead-free piezoelectric ceramics. [7][8][9][10][11][12] However, they suffer from a low piezoelectric constant and an unstable surface morphology.…”