Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 7, Issue 47, Pages 14845-14854Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9tc05143k
Keywords
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Funding
- National Natural Science Foundation of China [51562004, 61571142]
- Guangxi Natural Science Outstanding Youth Foundation [2016GXNSFFA380007]
- Guangxi Natural Science Foundation [2016GXNSFGA380001]
- Guangxi Key Laboratory of Information Materials (Guilin University of Electronic Technology) [171004-Z]
- Research Grants Council of the Hong Kong Special Administrative Region, China [PolyU152665/16E]
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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 d(33)* 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.
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