Effects of la concentration on the structural and dielectric properties of 0.57BiFeO/sub 3/-0.43PbTiO/sub 3/ crystalline solutions

Abstract

Crystalline solutions of 0.57(Bi(1-x)La(x))FeO(3)-0.43PbTiO(3) (BLF-PT) for x = 0, 0.1, 0.2, and 0.3 were fabricated by the traditional solid state reaction method. X-ray diffraction analysis revealed that the tetragonal torhombohedral phase transformation of BLF-PT occurred with an increase of the La content. The dielectric and ferroelectric properties of BLF-PT were investigated at room temperature for different La contents. BLF-PT revealed strong ferroelectric characteristics for the lower La composition, and transferred to relaxor ferroelectrics for x 0.2. The dielectric constant and remanent polarization were 1461 and 33.5 microC/cm(2), respectively, for BLF-PT of x = 0.2. The dielectric constant and polarization of BLF-PT were enhanced simultaneously with increasing La content. Our results demonstrate that BLF-PT is a competitive piezoelectric ceramic.

The effect of cooling rate on structural and electrical properties of multiferroic BLF‐PT ceramics

“…[6][7][8] La-modified BF-PT (BLF-PT) ceramics have attracted many attentions due to their excellent dielectric, piezoelectric, and ferromagnetic properties. 9,10 For example, the remnant polarization of 0.56(Bi 0.8 La 0.2 )FeO 3 -0.44PbTiO 3 achieved as high as 40 lC/cm 2 . 11 The thermal treatment process such as quenching after annealing has been reported as an effective method to enhance the dielectric and ferroelectric properties in BFbased ceramics with relatively high conductivities.…”

“…Cations substitutions and addition of the third end‐member have been considered to improve the dielectric and ferroelectric properties of BF‐PT and PMN‐PT ceramics . La‐modified BF‐PT (BLF‐PT) ceramics have attracted many attentions due to their excellent dielectric, piezoelectric, and ferromagnetic properties . For example, the remnant polarization of 0.56(Bi 0.8 La 0.2 )FeO 3 ‐0.44PbTiO 3 achieved as high as 40 μC/cm 2 …”

Compositional‐driven multiferroic properties in samarium substituted LaFeO3‐PbTiO3 solid solutions

“…8. 40 Second, lanthanum and samarium reduce the stresses at grain boundaries due to reduced lattice anisotropy which results in reduction in the value of coercive field for x=0. As the sample x=0.30 is cubic, it exhibits lossy P-E loop and is not shown here.…”

“…However, as the concentration of these ions increases, sufficient amount of lanthanum and samarium is there which can control the leakage current and results in high P r values for x=0.20 sample. 40 Second, lanthanum and samarium reduce the stresses at grain boundaries due to reduced lattice anisotropy which results in reduction in the value of coercive field for x=0. 20.…”

Flexible piezoelectric energy harvester/sensor with high voltage output over wide temperature range

“…PbTiO3 (TC = 490 ℃). The MPB composition of La modified (1-x)BiFeO3-xPbTiO3 (BLF-PT) was reported to locate at x = 0.43 with Curie temperature of 355 °C, possessing good piezoelectric properties [11,12]. It is worth noting that the Curie temperature of the BLF-PT MPB composition is higher than for most perovskite-structured piezoelectric materials, while it has comparable piezoelectric performance.…”