Origin of the Large Field-Induced Strain and Enhanced Energy Storage Response of Rare-Earth-Doped Lead-Free 0.854BNT–0.12BKT–0.026BT Ceramics

Ultrahigh Ferroelectric and Piezoelectric Properties in BiFeO3–BaTiO3 Epitaxial Films Near Morphotropic Phase Boundary

“…Comparison of ferroelectric and piezoelectric properties of the BF–BT films in this study with (Bi x Na 1– x )­TiO 3 (BNT)-based, − (K x Na 1– x )­NbO 3 (KNN)-based, − BFO-based, ,, and lead-based , materials systems. Different systems are represented by symbols of different colors.…”

Elucidating the capacitive behavior of Gd-doped BNT-BKT-BT electrodes in All-in-One supercapacitor devices

“…From the peak splitting, which can be observed for the (111) peak around 40°, it has been observed that rhombohedral symmetry is dominant for the undoped ceramic. However, the presence of tetragonal symmetry in the undoped BNT-BKT-BT ceramic, and rhombohedral symmetry, can be seen from a slight peak splitting, which can be observed in the (002) peak around 46.6° [2]. A shift towards higher 2θ angles in the (002) peak of 0.01 mol% Gd doping indicates that the Gd 3+ (1.24 Å) cation prefers substituting the A-site in the perovskite structure.…”

“…Except for the 5% Gd-doped ceramic, a pure perovskite structure was obtained without any secondary phase, but slight changes were observed in the main peaks of the undoped, 0.001, 0.01, 0.1, 0.5, and 1% Gd-doped BNT-BKT-BT ceramics. Although Gd has been added in excess amounts of stoichiometric compositions, these slight changes in the structure clearly show in figure 2 that Gd has entered into the perovskite lattice for 0.001, 0.01, 0.1, 0.5, and 1% Gd-doped ceramics [2]. For the 5% Gd-doped ceramic, it can be said that Gd has precipitated as a secondary grain boundary phase because the doping amount is higher than the solubility limit of Gd in the perovskite lattice.…”

“…The calcination of the dried powders was carried out at 850 °C for 2 h. After calcination, a binder was added to granulate the dried powders, and then the coarse powders were drypressed under 100 MPa into 12 mm in diameter disc-shaped pellets. The pellets were sintered at 1150 °C for 2 h, following the procedure established in our previous study [2].…”

“…Because of their outstanding piezoelectric characteristics, lead (Pb)-based piezoelectric ceramics are also frequently employed in actuators and transducers. However, the toxicity of leadbased oxides has caused research to move toward lead-free ceramics in recent years [1,2]. For that purpose, Bibased ceramics have made significant advances recently [3].…”