Abstract
A kind of piezoelectric ink was prepared with Li, Ta, Sb co-doped (K, Na)NbO3 (KNN) powders. Piezoelectric scaffolds with diameters at micrometer scale were constructed from this ink by using direct ink writing method. According to the micro-morphology and density test, the samples sintered at 1100 °C for 2 h have formed ceramics completely with a high relative density of 98%. X-ray diffraction (XRD) test shows that the main phase of sintered samples is orthogonal (Na0.52K0.4425Li0.0375)(Nb0.87Sb0.07Ta0.06)O3. The piezoelectric constant d33 of 280 pC/N, dielectric constant ε of 1775, remanent polarization Pr of 18.8 μC/cm2 and coercive field Ec of 8.5 kV/cm prove that the sintered samples exhibit good electrical properties. The direct ink writing method allows one to design and rapidly fabricate piezoelectric structures in complex three-dimensional (3D) shapes without the need for any dies or lithographic masks, which will simplify the process of material preparation and offer new ideas for the design and application of piezoelectric devices.
Highlights
Environmentally-friendly lead-free piezoelectric ceramics have attracted much attention in recent years
For the structure design refers to the KNN-based piezoelectric devices such as the sensors, transducers and actuators [13,14,15,16,17], most of which are fabricated by the 1–3 KNN composite [18,19,20] or the single crystalline KNN nanostructures [21,22,23,24]
The X-ray diffraction (XRD) pattern of the KNN powders (Figure 2b) shows the main phase is (Na0.52K0.4425Li0.0375)(Nb0.87Sb0.07Ta0.06)O3 which is prepared by the co-additive of Li, Sb, and Ta in the (K, Na)NbO3 powders
Summary
Environmentally-friendly lead-free piezoelectric ceramics have attracted much attention in recent years. For the structure design refers to the KNN-based piezoelectric devices such as the sensors, transducers and actuators [13,14,15,16,17], most of which are fabricated by the 1–3 KNN composite [18,19,20] or the single crystalline KNN nanostructures [21,22,23,24]. Technique is a powerful fabrication method in building 3D KNN piezoelectric scaffolds due to its favorable performance. We prepared methyl methacrylate based suspensions of KNN inks and fabricated 3D piezoelectric woodpile structures with various structural parameters by using DIW technique. The phase composition, the microstructure and the piezoelectric parameters of the sintered samples were observed
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