Ultrahigh piezoelectric coefficient of a lead-free K0.5Na0.5NbO3-based single crystal fabricated by a simple seed-free solid-state growth method

Minhong Jiang, Jingwei Zhang, Guanghui Rao, Dedong Li, Clive A. Randall, Tao Li, Biaolin Peng, Lin Li, Zhengfei Gu, Xinyu Liu, Haitao Huang

Research output: Journal article publicationJournal articleAcademic researchpeer-review

23 Citations (Scopus)


Lead-free has been a goal that people pursue due to the environmental pollution caused by lead in lead-based materials. K0.5Na0.5NbO3(KNN) is one of the most promising lead-free piezoelectric materials. Theoretically, the piezoelectric properties of single crystals are much better than those of polycrystalline materials. However, it is difficult to fabricate uniform KNN-based crystals by the high-temperature melt method because of volatilization of elements. This method also needs complicated equipment and is expensive. Here, a seed-free, solid-state crystal growth (SFSSCG) method was used to prepare Mn, Li, and Bi co-doped KNN crystals, which show an ultrahigh piezoelectric coefficient of about 1050 pC N-1, around one order of magnitude higher than that of pure KNN ceramics. Furthermore, the effective piezoelectric coefficient d33∗ of this crystal can reach 2290 pm V-1 at a unipolar electric field of 10 kV cm-1. This crystal also shows a high Curie temperature and good ferroelectricity. It is expected that the lead-free KNN-based single crystals fabricated by this simple method show promise for high performance ferroelectric and piezoelectric applications in industry and are environment-friendly.

Original languageEnglish
Pages (from-to)14845-14854
Number of pages10
JournalJournal of Materials Chemistry C
Issue number47
Publication statusPublished - 21 Dec 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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