High Piezoelectric Voltage Coefficient in Structured Lead-Free (K,Na,Li)NbO3 Particulate—Epoxy Composites

N. Kunnamkuzhakkal James, Daniella B. Deutz, Ranjita K. Bose, Sybrand van der Zwaag, Pim Groen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

23 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)3957-3963
Number of pages7
JournalJournal of the American Ceramic Society
Issue number12
Publication statusPublished - 2016


  • composites
  • ferroelectricity/ferroelectric materials
  • piezoelectric materials/properties
  • processing


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