Composition-driven phase evolution and piezoelectric properties of (1−x)(K_0.48Na_0.52)_0.96Li_0.04Nb_0.95Sb_0.05O₃−xBi_0.5 (Na_0.84K_0.16)_0.48Ba_0.02ZrO₃ lead-free ceramics

Multiphase coexistence and enhanced piezoelectric properties in (1−x)(K0.45Na0.55)(Nb0.965Sb0.035)O3− xBi0.5(K0.91Li0.09)0.5(Hf0.3Zr0.7)O3 lead-free ceramics

“…Over the past many years, a large number of researchers have committed to improving the piezoelectric performances of KNN-based ceramics by the way of chemical modifications and/or using new preparation methods [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. For example, Saito et al [20] in 2004 reported a giant piezoelectric constant (d 33 =416 pC/N) obtained in the Li + , Ta 5+ and Sb 5+ modified KNN-based ceramics fabricated by the reactive templated grain growth technique (RTGG).…”

“…By contrast, the chemical modification is a more economical method and thus is more likely suitable for large-scale commercial production. Especially, the chemical modification can readily result in the formation of a phase boundary (i.e., a coexistence of multiple phases), which may usually bring about an enhanced piezoelectric activity [15][16][17][18][19].…”