Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5Na0.5NbO3–0.04LiSbO3 lead-free piezoelectric ceramics

doi:10.1088/1674-1056/20/6/067701

Abstract Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K_{0.5 + x}Na_{0.5 + x}NbO₃-0.04LiSbO₃ lead-free piezoelectric ceramics were examined for 0 ≤ x ≤ 0.02. The piezoelectric coefficients exhibited a maximum, d₃₃= 187 pC/N at x=0.0075, coinciding with the maximum of the grain size and the apparent density at x=0.0075. The apparent density and the piezoelectric coefficients decreased with increasing x at higher x which was likely due to the crystal geometrical distortion of 0.96K_{0.5 + x}Na_{0.5 + x}NbO₃-0.04LiSbO₃. In addition, super-large grains were found and this may be due to liquid phase sintering. Excess (K⁺+Na⁺) attracted a sum of space charges to keep the charge neutral, resulting in charge leakage during the course of ceramic polarization, influencing the piezoelectric and ferroelectric properties. These findings are of importance for guiding the design of K_0.5Na_0.5NbO₃-based lead-free ceramics with enhanced electrical properties.

Keywords: lead-free ceramics piezoelectric non-stoichiometry K_0.5Na_0.5NbO₃

Received: 15 October 2010
Revised: 19 January 2011
Accepted manuscript online:

PACS:	77.65.Bn	(Piezoelectric and electrostrictive constants)
	77.80.B-	(Phase transitions and Curie point)
	77.84.-s	(Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10804130 and 60871027), the Natural Science Foundation of Shaanxi Province of China (Grant No. 2009JQ1001), and the Funds of the Key Laboratory of Electrical Insulation and Power Equipment (Grant No. EIPE10202).

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Zhao Jing-Bo(赵静波), Du Hong-Liang(杜红亮), Qu Shao-Bo(屈绍波), Zhang Hong-Mei(张红梅), and Xu Zhuo(徐卓) Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K_0.5Na_0.5NbO₃–0.04LiSbO₃ lead-free piezoelectric ceramics 2011 Chin. Phys. B 20 067701

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Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K0.5Na0.5NbO3–0.04LiSbO3 lead-free piezoelectric ceramics

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Effects of A-site non-stoichiometry on the structural and electrical properties of 0.96K_0.5Na_0.5NbO₃–0.04LiSbO₃ lead-free piezoelectric ceramics