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Open AccessArticle

Direct Ink Writing of Three-Dimensional (K, Na)NbO3-Based Piezoelectric Ceramics

by Yayun Li 1,*, Longtu Li 1 and Bo Li 2
1
State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
2
Research Institute for Advanced Materials, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
*
Author to whom correspondence should be addressed.
Academic Editor: Javier Narciso
Materials 2015, 8(4), 1729-1737; https://doi.org/10.3390/ma8041729
Received: 11 March 2015 / Revised: 31 March 2015 / Accepted: 8 April 2015 / Published: 14 April 2015
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. View Full-Text
Keywords: (K, Na)NbO3 (KNN); direct ink writing; 3D structures (K, Na)NbO3 (KNN); direct ink writing; 3D structures
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Li, Y.; Li, L.; Li, B. Direct Ink Writing of Three-Dimensional (K, Na)NbO3-Based Piezoelectric Ceramics. Materials 2015, 8, 1729-1737.

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