Effect of heating rate on the structure evolution of (K 0.5Na0.5)NbO3-LiNbO3 lead-free piezoelectric ceramics

Daijun Liu, Hongliang Du, Fusheng Tang, Fa Luo, Dongmei Zhu, Wancheng Zhou

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Lead-free piezoelectric ceramics (1∈-∈x)(K0.5Na 0.5)NbO3-xLiNbO3 (abbreviated an KNLN) have been synthesized by traditional ceramics process. Effects of heating rate on the phase structure, microstructure evolution and piezoelectric properties of (1∈-∈x)(K0.5Na0.5)NbO3-xLiNbO 3 were investigated. Results show that the heating rate has no effects on the phase structures. However, the fracture surface of the 0.94(K0.5Na0.5)NbO3 -0.06 LiNbO3 ceramics transforms from intergranular fracture mode to a typical transgranular fracture mode with the increasing of the heating rate. This result is ascribed to the presence of agglomerates of grains which exhibit different sintering behavior at diverse heating rates. The 0.94(K0.5Na 0.5)NbO3-0.06LiNbO3 ceramic sintered at 1080°C with heating rate of 5°C/min shows the optimum piezoelectric properties(d 33∈=∈210 pC/N, k p∈=∈0. 403 and k t∈=∈0.498).

Original languageEnglish
Pages (from-to)107-111
Number of pages5
JournalJournal of Electroceramics
Volume20
Issue number2
DOIs
StatePublished - Apr 2008

Keywords

  • (KNa)NbO -LiNbO
  • Lead-free piezoelectric ceramics
  • Microstructure evolution
  • Piezoelectric properties

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