Structure evolution and electrical properties of lead-free Bi0.5Na0.41K0.09TiO3 piezoceramics by isovalent La doping

Enhanced electric field-induced strain and electrostrictive response of lead-free BaTiO3-modified Bi0.5(Na0.80K0.20)0.5TiO3 piezoelectric ceramics

“…As well as concerning the legislations oppose the use of toxic elements, several of the hard researches have been devoted to exploring the competitive lead-free counterparts, aiming to substitute the PZT-based oxide ceramics in the future [3][4][5]. Extensive researches have been carried out and search for lead-free piezoceramics over the past decade, for example, Bi 0.5 Na 0.5 TiO 3 (BNT), BaTiO 3 (BT), or K 0.5 Na 0.5 NbO 3 (KNN)-based systems [6,7].…”

“…The compositional modifications are greatly desirable to reduce the E c value and improve the electrical properties, such as piezoelectric, electric field-induced strain, ferroelectric, and dielectric properties, through the construction of MPB between the rhombohedral R3c (Bi 0.5 Na 0.5 TiO 3 , BNT) and tetragonal P4bm (Bi 0.5 K 0.5 TiO 3 , BKT) [11,12]. A classical of the Bi 0.5 (Na 1-x K x ) 0.5 TiO 3 (BNKTx) system exhibits excellent electromechanical response, piezoelectric, and ferroelectric at MPB of 16 -20% BKT content [7,11,13]. The improvement in electrical properties (i.e.…”

“…dielectric and piezoelectric properties) of the BNKTx ceramics at MPB was found to be similar to that observed in the PZT ceramic. The giant electromechanical strain has occurred when the BNKTx ceramics at MPB was modified with other ABO 3 compounds [7].…”