Microstructure and piezoelectric properties of textured (Na0.84K0.16)0.5Bi0.5TiO3 lead-free ceramics

Reactive templated grain growth and anisotropic electrical properties of (Na0.5K0.5)NbO3 ceramics without sintering aids

“…Among these methods, (R)TGG proves to be suitable for a material with cubic symmetry, particularly for perovskite structure materials. Crystallographic texturing of polycrystalline ferroelectric ceramics, such as Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 [20], Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zr,Ti)O 3 [21], Bi 0.5 (Na,K) 0.5 TiO 3 [22], Sr 0.53 Ba 0.47 Nb 2 O 6 [23], and (K,Na,Li)(Nb,Ta,Sb)O 3 [12], results in greatly enhanced piezoelectric properties that can reach C50% of single-crystal values [24]. Saito et al showed that Li ?…”

Effects of chemical modification on the structural and electrical properties of (Ba0.90Ca0.10)0.90(Na0.5Bi0.5)0.10TiO3 ceramics

“…However, pure NBT has a drawback of high coercive field, E c = 7.3 kV/mm and the high conductivity causes problems during the poling process. To improve the properties of NBT, more researches have focused on NBT-based solid solutions such as BNT-BaTiO 3 [2][3][4][5][6], BNT-SrTiO 3 [7], BNT-PbTiO 3 [8], BNT-BiFeO 3 [9][10][11], BNT-Bi 0.5 K 0.5 TiO 3 [12], BNT-BiScO 3 [10], BNT-NaNbO 3 [13], BNT-Bi 0.5 K 0.5 TiO 3 -BaTiO 3 [14,15], BNT-KNbO 3 -0.5(Bi 2 O 3 ·Sc 2 O 3 ) [15], BNT-Ba(Cu 0.5 W 0.5 )O 3 [16], (Na 0.5 Bi 0.5 ) 1−1.5x La x TiO 3 [17], (Na 0.84 K 0.16 ) 0.5 Bi 0.5 TiO 3 [18], (Bi 0.95 Na 0.75 K 0.20 ) 0.5 Ba 0.05 TiO 3 [19] and (Bi 1−y (Na 1−x−y Li x )) 0.5 Ba y TiO 3 [20]. Among them, these relaxor characteristics can be improved by Ba [2][3][4][5][6], Sr [7] or Pb [8] ions doping.…”

“…Among them, these relaxor characteristics can be improved by Ba [2][3][4][5][6], Sr [7] or Pb [8] ions doping. Compared with pure NBT ceramics, compositions modified with kalium [12,14,18,19] and lithium [20] ions show improved piezoelectric properties and they pole easily. These cation-dopinginduced complex features in NBT systems have shown that they are still very active candidates in both theoretical and experimental investigations.…”

Processing optimization and piezoelectric properties of textured Ba(Zr,Ti)O3 ceramics

“…Hence, the volume fraction of the randomly oriented grains in the samples is reduced, and the degree of orientation is increased with the rising of the sintering temperature form 1350°C to 1450°C. However, when the sintering temperature are higher than 1450°C, matrix grains grow to a size comparable to that of oriented grains at the initial stage of sintering, and the growth rates of oriented grains and matrix grains become comparable [17,18]. Due to the large growth rate of the matrix grains, some oriented grains may disappear during the grain growth of matrix, which results in decreasing of the degree of orientation.…”