Ergodicity and nonergodicity in La-doped Bi1/2(Na0.82K0.18)1/2TiO3 relaxors

Comparative Study of Conventional and Microwave Sintering of Large Strain Bi-Based Perovskite Ceramics

“…We propose that the broadened peaks at higher values of T s in the MWS-derived ceramics may be ascribed to the improvement in density and/or grain size, which contributes to decrease the leakage current and enhances the ferroelectricity. It was also reported that the increased sintering temperature in (Na 0.5 K 0.5 )NbO 3 -based materials can enhance ferroelectricity [39] or rhombohedral symmetry in MWS-derived specimens [16,[23][24][25][26][27][28][29][30][31]. Previous studies on the effect of BaZrO 3 (BZ)-modification on the crystal structure of BNKT ceramics [32] have found that the BZ modification induces a phase transition from rhombohedral to pseudocubic symmetry.…”

“…In this respect, Biperovskite compounds have also attracted much attention as leadfree actuator materials, because of their large strains [16,[23][24][25][26][27][28][29][30][31]. The large strain observed at the normal and relaxor ferroelectric phase boundary was recently found to be closely related to the nanoscale composite of the normal and relaxor ferroelectric phases [30].…”

“…However, as is known, BNKT ceramics are fired at temperatures higher than 1150°C, to achieve enough densification [16,[23][24][25][26][27][28][29][30][31]. Therefore, lowtemperature sintering is particularly important in the utilization of BNKT ceramics as the piezoelectrically active lead-free layer in lowcost MLAs.…”

Achieved High Energy Density and Excellent Thermal Stability in (1-x)(Bi0.5Na0.5)0.94Ba0.06TiO3-xBi(Mg0.5Ti0.5)O3 Relaxor Ferroelectric Thin Films

“…For BNT, RFEs are accessible by chemical modifications at room temperature. Thus, a number of perovskite compounds, for instance, BaTiO 3 [18], Bi 0.5 K 0.5 TiO 3 [19] , SrTiO 3 [20], NaNbO 3 [21] are combined with BNT to form RFEs to reduce the polarization hysteresis and improve the energy storage density and efficiency [22].…”

Large Electric Field-Induced Strain Response Under a Low Electric Field in Lead-Free Bi1/2Na1/2TiO3-SrTiO3-BiAlO3 Ternary Piezoelectric Ceramics

“…[4][5][6][7][8][9][10][11][12][13][14] (Bi 1/2 Na 1/ 2 )TiO 3 (BNT)-based ceramics are of particular interest for actuator applications because of their excellent electromechanical strain properties. [15][16][17][18][19][20][21] It is understood that the large electromechanical strain (referred to as incipient piezoelectricity) in BNTbased ceramics originates from a reversible electric field-induced phase transition from an ergodic relaxor (ER) phase to a ferroelectric via application of an electric field. [22][23][24][25] However, high electric fields are normally required to obtain large electromechanical strain properties in these incipient piezoceramics.…”