Residual tensile stresses and piezoelectric properties in BiFeO3-Bi(Zn1/2Ti1/2)O3-PbTiO3 ternary solid solution perovskite ceramics

Abstract

For low dielectric loss perovskite-structured (1-x-y)BiFeO3-xBi(Zn1/2Ti1/2)O3-yPbTiO3 (BF-BZT-PT) (x = 0.04-0.15 and y = 0.15-0.26) ceramics in rhombohedral/tetragonal coexistent phase, structural phase transitions were studied using differential thermal analyzer combined with temperature-dependent dielectric measurement. Two lattice structural phase transitions are disclosed in various BF-BZT-PT perovskites, which is different from its membership of BiFeO3 exhibiting just one lattice structural phase transition at Curie temperature TC= 830oC. Consequently, residual internal tensile stresses were revealed experimentally through XRD measurements on ceramic pellets and counterpart powders, which are reasonably attributed to special structural phase transition sequence of BF-BZT-PT solid solution perovskites. Low piezoresponse was observed and argued extrinsically resulting from residual tensile stresses pinning ferroelectric polarization switching. Post-annealing and subsequent quenching was found effective for eliminating residual internal stresses in those BZT-less ceramics, and good piezoelectric property of d33 ≥ 28 pC/N obtained for 0.70BF-0.08BZT-0.22PT and 0.05 wt% MnO2-doped 0.70BF-0.04BZT-0.26PT ceramics with TC ≥ 640oC, while it seemed no effective for those BZT-rich BF-BZT-PT ceramics with x = 0.14 and 0.15 studied here.

Low‐temperature sintering of BF‐PT‐BZ ternary solid solutions with enhanced piezoelectric properties

“…6,7 Most recently, the ternary system has been designed to reduce the c/a ratios and improve piezoelectric properties of BF-PT based ceramics. The third end-members, such as PbZrO 3 , 8,9 Bi(Zn 1/3 Ti 2/3 )O 3 , 10,11 BaTiO 3 ,12,13 BaZrO 3 , [14][15][16][17] and Ba(Zr 0.25 Ti 0.75 )O 3 , 18 have been incorporated with BF-PT binary ceramics making the most interesting materials for high-performance piezoelectric applications. Among these, BF-PT-BZ ternary ceramics with BZ content of less than 10 at% have been fabricated to possess a high T c of 540°C and a d 33 of 117 pC/N, 15 while a large bipolar strain of 0.45% with a high d 33 of 270 pC/N 14 has been achieved for BZ of close to 20 at%.…”

Physics‐Guided Data‐Mining Driven Design of Room‐Temperature Multiferroic Perovskite Oxides

“…In material community, BiFeO 3 ‐based ceramics are known exhibiting high leakage current and dielectric loss . Even though forming a ternary solid solution is an effective way to fabricate robust insulating BiFeO 3 ‐based multiferroic ceramics than forming a binary solid solution through improving thermodynamic stability of BiFeO 3 perovskite, whether their ceramic samples are highly resistive or not is closely associated with optical bandgap ( E g ) of BiFeO 3 ‐based ternary solid solutions . E g ≈1.63 eV was determined recently for BF–0.25BC –y PT ( y = 0.25 and 0.35) double perovskite oxides using optical absorbance measurements.…”