Low-temperature–sintered CuF2-doped NKN ceramics with excellent piezoelectric and dielectric properties

Chung Ming Weng, Cheng Che Tsai, Jyh Sheen, Cheng Shong Hong, Sheng Yuan Chu, Zong You Chen, Hsiu Hsien Su

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Lead-free CuF2-doped NKN ceramics (NKNCFx, x = 0–2.5 mol%) were prepared using a conventional mixed oxide method to investigate the effects of CuF2additives on the microstructure, oxygen vacancies, and electrical properties of these materials. The addition of CuF2enabled a reduction in sintering temperature from 1100–950 °C, and doping with appropriate quantities of fluorine reduced the dielectric loss, due to a charge balance of electrons and holes. Under low frequencies at high temperatures, the dielectric constant and space charge effect gradually increased with the addition of CuF2. At x > 0.5, the dielectric constant was very high (>250,000) when the heating temperature was close to the tetragonal–cubic phase transition temperature (TC). Compared to pure NKN ceramics sintered at 1100 °C, the proposed NKNCFxceramics sintered at 1000 °C with x = 1.5 exhibited excellent piezoelectric properties: kp: 39.5% (34.3%); kt: 51% (42%); Qm: 2331 (163); d33: 96 pC/N (81 pC/N); and tanδ: 0.1% (5%) as well as the high thermal stability required for most practical applications.

Original languageEnglish
Pages (from-to)1028-1037
Number of pages10
JournalJournal of Alloys and Compounds
Volume698
DOIs
Publication statusPublished - 2017 Jan 1

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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