Microstructure and electrical properties of NaNbO<sub>3</sub>-BaTiO<sub>3</sub> lead-free piezoelectric ceramics

doi:10.1007/s11465-009-0050-9

Front Mech Eng Chin

2009, Vol. 4

Issue (3) : 345-349 https://doi.org/10.1007/s11465-009-0050-9

RESEARCH ARTICLE

Microstructure and electrical properties of NaNbO₃-BaTiO₃ lead-free piezoelectric ceramics

Shihui XIE(

), Kongjun ZHU, Jinhao QIU, Hua GUO

Aeronautic Key Laboratory for Smart Materials & Structures, Nanjing University of Aeronautics & Astronautics, Nanjing, 210016, China

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Abstract

Lead-free piezoelectric ceramics (1-x)NaNbO₃-xBaTiO₃ have been fabricated by a traditional ceramic sintering technique. The effects of BaTiO₃ (BT) synthesized by hydrothermal method on crystal structure, density, dielectric, piezoelectric, and electromechanical properties were investigated. Results show that the phase structure transforms from the orthorhombic phase to the tetragonal phase with the increase of the content of BT, and the two phases co-exist when 0.08<x≤0.10. However, the optimum composition for (1-x)NaNbO₃-xBaTiO₃ ceramics is 0.90NaNbO₃-0.10BaTiO₃. The 0.90NaNbO₃-0.10BaTiO₃ ceramics sintered at 1250°C have higher properties: piezoelectric constant d₃₃ of 120 pC/N, dielectric constant ?_r of 718, planar electromechanical coupling factor k_p of 24%, planar frequency N_d of 3 MHz·mm, and the mechanical quality factor Q_m of 138, respectively. The results show that the (1-x)NaNbO₃-xBaTiO₃ ceramics is one of the promising lead-free materials for high-frequency applications.

Keywords Lead-free piezoelectric ceramics NaNbO₃-BaTiO₃ piezoelectricity ceramics crystal structure microstructure

Corresponding Author(s): XIE Shihui,Email:xshahnu@126.com

Issue Date: 05 September 2009

Cite this article:

Shihui XIE,Kongjun ZHU,Jinhao QIU, et al. Microstructure and electrical properties of NaNbO₃-BaTiO₃ lead-free piezoelectric ceramics[J]. Front Mech Eng Chin, 2009, 4(3): 345-349.

URL:

https://academic.hep.com.cn/fme/EN/10.1007/s11465-009-0050-9
https://academic.hep.com.cn/fme/EN/Y2009/V4/I3/345

Fig.1 XRD patterns of (1-)NaNbO-xBaTiO ceramics in ranges of 2. (a) From 20° to 60°; (b) from 20° to 26°; (c) from 41° to 51°

Fig.2 SEM micrographs of the fracture surface of 0.88NaNbO-0.12BaTiO ceramics with different sintering temperatures (a) =1200°C, (b) =1225°C, (c) =1250°C, (d) =1275°C, (e) =1300°C

Fig.3 Relative density of (1-)NaNbO-BaTiO

Fig.4 Dependence of and on content of BaTiO

Fig.5 Variations in , , and value of (1-)NaNbO-BaTiO

Fig.6 P-E hysteresis loops of (1-)NaNbO-BaTiO ceramics with different sintered at 1250°C

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