Enhanced electrical properties of NaBi modified CaBi2Nb2O9-based Aurivillius piezoceramics via structural distortion

Stable piezoelectric response of 0-3 type CaBi2Nb2O9:xwt%BiFeO3 composites for high-temperature piezoelectric applications

“…Sharp peaked dielectric permittivity at 948°C is due to the ferroelectric to the paraelectric phase transition of the pure single phased CBN ceramic in Figure 6(a). This behavior is consistent with earlier reported results [35] 5(b)). The ε r value of CBN:40 wt% BFO with 0-3 type connectivity is 2010.11 at 881°C for 10 kHz frequency (Figure 6(c)), which is much higher than that of pure CBN ceramic (ε r = 930.4) and other composites.…”

Structure-property relationships in the lanthanide-substituted PbBi2Nb2O9 Aurivillius phase synthesized by the molten salt method

“…It is observed in the enlarged XRD patterns in Fig. 1 that the 200/ 020 doublet of the PBNO sample at 2θ = 32-33˚ is typical for the A2 1 am orthorhombic crystal structure [19,20]. With Ln 3+ substitution, these peaks almost merge to a single peak in both cases, which indicates that the structure becomes close to tetragonal [18,20].…”

“…1 that the 200/ 020 doublet of the PBNO sample at 2θ = 32-33˚ is typical for the A2 1 am orthorhombic crystal structure [19,20]. With Ln 3+ substitution, these peaks almost merge to a single peak in both cases, which indicates that the structure becomes close to tetragonal [18,20]. This change in the degree of orthorhombicity can also be expected to affect the ferroelectric properties, as discussed further below.…”

“…However, a slight shifting is observed in both modes as shown in Fig. 5, which is induced by the occupation of Ln 3+ on the A-site of the perovskite layer [19,20], as revealed by neutron diffraction analysis. The substitution of larger La 3+ results in a longer Nb-O bond and thereby lowered bond strength, shifting the vibration modes to lower wavenumbers of 565 and 813 cm −1 .…”

Dielectric, ferroelectric, and piezoelectric properties of Gd-modified CaBi2Nb2O9 high Curie temperature ceramics

“…Because of the reversal of spontaneous dipoles, the current peaks in the J-E loops emerge near the coercive field (E c ). It is generally believed that switching current peak is a more accurate way to evaluate the ferroelectric properties of materials [41][42][43][44][45]. As shown in Fig.…”