High Piezoelectric Voltage Coefficient in Structured Lead‐Free (K,Na,Li)NbO3 Particulate—Epoxy Composites |
| |
| Authors: | Nijesh K. James Daniella B. Deutz Ranjita K. Bose Sybrand van der Zwaag Pim Groen |
| |
| Affiliation: | 1. Novel Aerospace Materials Group, Faculty of Aerospace Engineering, Delft University of Technology, Delft, The Netherlands;2. Holst Centre, TNO, Eindhoven, The Netherlands |
| |
| Abstract: | A high‐voltage coefficient has been found in lead‐free piezoelectric particulate composites based on epoxy with lead‐free (K0.50Na0.50)0.94Li0.06NbO3 (KNLN) piezoceramic particles with a natural cubic morphology. The KNLN powder used in the composites has been prepared using a new solid‐state double calcination processing route. These particles were subsequently used to create random and structured KNLN‐epoxy composites. Using dielectrophoresis, these natural cubical KNLN particles were structured into one‐dimensional chains inside the epoxy matrix. Composites produced with these powders showed piezoelectric properties about a factor of 2 higher than those of composites processed with conventionally calcined KNLN powders. The dielectrophoretically structured KNLN‐epoxy composites with optimized particle size and morphology showed excellent piezoelectric properties, which can replace lead containing piezoelectric composites for sensor and energy harvesting applications in future. |
| |
| Keywords: | piezoelectric materials/properties ferroelectricity/ferroelectric materials composites processing |
|
|
