Tailored electrical properties in ternary BiScO3-PbTiO3 ceramics by composition modification

High‐temperature multilayer actuators based on CuO added BiScO3–PbTiO3 piezoceramics and Ag electrodes

“…Rhombohedral and tetragonal phases coexist in the BS‐PT: x CuO ( x = 0.1‐0.5wt%) ceramics sintered at 900°C and their MPBs exist at x = 0.1‐0.3wt%. It is well known that there are MPBs of rhombohedral and tetragonal phases in BS‐PT ceramics sintered at ~1080°C . Although these ceramics were just sintered at a relative low temperature of 900°C, these ceramics already show pure ABO 3 ‐type phase according to their XRD patterns shown in Figure A.…”

“…It is well known that there are MPBs of rhombohedral and tetragonal phases in BS-PT ceramics sintered at ~1080°C. 6,7,[10][11][12][13] Although these ceramics were just sintered at a relative low temperature of 900°C, these ceramics already show pure ABO 3 -type phase according to their XRD patterns shown in Figure 1A. Furthermore, the MPBs still exist in the BS-PT:xCuO (x = 0.1-0.3wt%) ceramics since there are the splits of the tetragonal [002] T peak, the [200] T peak, and the rhombohedra [200] R peak in Figure 1B.…”

“…(1− x )BiScO 3 ‐ x PbTiO 3 piezoelectric ceramic may be a good candidate for the preparation of high‐temperature multilayer actuator. It is noted that the morphotropic phase boundaries (MPBs) of (1− x )BiScO 3 ‐ x PbTiO 3 ceramic are always at x ~0.63 at 20‐450°C which is an essential factor to achieve the commercial piezoelectric ceramics with high piezoelectric stability during the temperature changing process . Furthermore, the 0.367BiScO 3 –0.633PbTiO 3 (BS‐PT) ceramic shows excellent piezoelectric and electromechanical properties (eg, piezoelectric coefficient d 33 > 450 pC/N and electromechanical coupling factor k p ~ 0.56) …”

“…It is noted that the morphotropic phase boundaries (MPBs) of (1−x)BiScO 3 -xPbTiO 3 ceramic are always at x~0.63 at 20-450°C which is an essential factor to achieve the commercial piezoelectric ceramics with high piezoelectric stability during the temperature changing process. [10][11][12][13] Furthermore, the 0.367BiScO 3 -0.633PbTiO 3 (BS-PT) ceramic shows excellent piezoelectric and electromechanical properties (eg, piezoelectric coefficient d 33 > 450 pC/N and electromechanical coupling factor k p ~ 0.56). [10][11][12][13][14][15][16][17] It is still a big challenge to prepare the cost-effective multilayer actuator with BS-PT piezoelectric slices and Ag electrodes.…”

Ultralow sintering temperature and piezoelectric properties of Bi(Zn1/2Ti1/2)O3−BiScO3−PbTiO3 for low‐temperature co‐firing applications

“…Figure 1A The fitted XRD patterns also illustrate that all these compositions locate on MPB area with coexistence of the rhombohedral and the tetragonal symmetry. [13][14][15] The diffraction peak intensities change apparently while comparing the identical compositions sintered at 750 • C and 850 • C. Quantitative calculations on the ratio of (200) R /(200) T intensity according to Figure 1B present that the rhombohedral and the tetragonal phase content varies over the compositions and sintering temperatures. The calculated rhombohedral ratio of 𝜒 𝑟 (= I 200, r /[I 200, r +I 200, t +I 002, t ], I is the peak intensity) is 16.8%, 12.4%, 18.2%, respectively, for 7BZT−32BS−61PT, 9BZT−32BS−59PT, and 11BZT−32BS−57PT sintered at 750 • C. The ratios decreased to 15.6%, 10.9%, 11.3%, indicating less rhombohedral content at higher sintering temperature of 850 • C.…”