Domain Configuration and Thermal Stability of (K_0.48Na_0.52)(Nb_0.96Sb_0.04)O₃–Bi_0.50(Na_0.82K_0.18)_0.50ZrO₃ Piezoceramics with High d₃₃ Coefficient

Abstract

The domain configuration of lead-free (K0.48Na0.52)(Nb0.96Sb0.04)O3-Bi0.50(Na0.82K0.18)0.50ZrO3 ceramics with rhombohedral-tetragonal morphotropic phase boundary, accounting for the high piezoelectric property and good thermal stability, were systematically studied. Short domain segments (before poling) and long domain stripes with wedge-shaped or furcated ends (after poling) were found to be typical domain configurations. The reduced elastic energy, lattice distortion, and internal stress, due to the coexistence of rhombohedral and tetragonal phases, result in much easier domain reorientation and domain wall motion, responsible for the high piezoelectric properties, being on the order of 460 pC/N, in which the extrinsic contribution from irreversible domain switching was estimated to be around 50% of the total piezoelectricity. Minor piezoelectric property variations (<6% over a temperature range from -50 to 100 °C) were observed as a function of temperature, showing a good thermal stability. In addition, nanodomains (50 ± 2 nm) were found to be assembled into domain stripes after poling, believed to benefit the high piezoelectric properties but not causing much thermal instability due to the small quantity.

Large nonlinear dielectric behavior in BaTi1−xSnxO3

“…Such a phenomenon was also validated in both lead-based and lead-free piezoceramics. Zhang 30 reported that nanodomains (50 ± 2 nm) could be assembled into domain stripes after poling, thus benefit the high piezoelectric properties.

Figure 4TEM images of ( a ) BTSn11, ( b ) BTSn15 and ( c ) BTSn20 at room temperature.

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

“…The field‐induced strains of ferroelectric ceramics consist of the contribution of extrinsic irreversible non‐180 o domains switch, domain wall motion, as well as the intrinsic lattice distortion . The extrinsic contribution can be represented by S neg , which was determined by the maximum negative strain of bipolar S ‐ E loops.…”

Improving piezoelectric properties and temperature stability for KNN‐based ceramics sintered in a reducing atmosphere

“…In Figure , the T e increases from 60°C to 80°C at z = 0‐0.02 and then decreases from 70 to 40°C at z = 0.04‐0.06. Nano‐domains (50 ± 2 nm) are found to be assembled into domain stripes after poling, which benefits the high piezoelectric properties and preserves good thermal instability . In Figure , the ceramics at z = 0.02 show a complex domain structure, which consists of smaller domains (~70 nm) inside larger submicron domains (~200 nm).…”