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- W2897399558 abstract "Demand for replacing the current lead-based piezoelectric materials with some lead-free ones becomes increasingly strong from environmental concerns. In this article, we report the piezoelectric performance, the phase transitions, and the domain configurations of highly dense 0.96(K0.48Na0.52)(Nb0.96Sb0.04)O3−0.04(Bi0.50Na0.50)ZrO3 ceramics prepared by two step-sintering through solid-state reaction. This material has outstanding piezoelectric properties of piezoelectric coefficient d33 = 512 pC/N and electromechanical coupling coefficient kp ≈ 0.56 at room temperature. While d33 exhibits a broad peak and is greater than 430 pC/N between −30 °C and 70 °C, kp depends weakly on temperature below 50 °C but decreases considerably with further increasing the temperature. In terms of thermal aging, both d33 and kp remain stable from −50 °C to 240 °C. The degradation of kp quickly stabilizes in the first thermal cycle between −50 °C and 150 °C. Furthermore, the measurement of relative dielectric permittivity e′ upon heating indicates that rhombohedral-orthorhombic, orthorhombic-tetragonal, and tetragonal-cubic phase transitions occur at TR-O ≈ −40 °C, TO-T ≈ 54 °C, and TC ≈ 265 °C, respectively. The X-ray diffraction analysis shows that the crystalline structure at room temperature is of orthorhombic-tetragonal phase coexistence. We also investigate the domain structure with an acid etching technique. The unpoled ceramic exhibits a complicated domain pattern consisting of irregularly shaped domains of long parallel stripes separated by 180° domain boundaries from neighboring domains. In contrast, upon poling, the domain pattern becomes simpler and takes the form of long parallel stripes of diverse widths, with a hierarchical nanodomain structure appearing inside some of the broader stripes. We consider that the superior piezoelectric properties and reasonable temperature stability are closely related to the rhombohedral-orthorhombic and orthorhombic-tetragonal phase transitions and to the characteristic domain structure." @default.
- W2897399558 created "2018-10-26" @default.
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- W2897399558 date "2018-10-28" @default.
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- W2897399558 title "Piezoelectric performance, phase transitions, and domain structure of 0.96(K<sub>0.48</sub>Na<sub>0.52</sub>)(Nb<sub>0.96</sub>Sb<sub>0.04</sub>)O<sub>3</sub>−0.04(Bi<sub>0.50</sub>Na<sub>0.50</sub>)ZrO<sub>3</sub> ceramics" @default.
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- W2897399558 doi "https://doi.org/10.1063/1.5048345" @default.
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