Phase Transition and High Piezoactivity of Sr Doped Lead-Free (Na0.53K0.422Li0.048)(Nb0.89Sb0.06Ta0.05)O3 Ceramics

Chin. Phys. Lett.

2008, Vol. 25

Issue (7): 2573-2576 DOI:

Original Articles

Phase Transition and High Piezoactivity of Sr Doped Lead-Free (Na_0.53K_0.422Li_0.048)(Nb_0.89Sb_0.06Ta_0.05)O₃ Ceramics

ZHENG Li-Mei, WANG Jin-Feng, MING Bao-Quan, QI Peng, DU Juan

School of Physics, State Key laboratory of Crystal Materials, Shandong University, Jinan 250100

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ZHENG Li-Mei, WANG Jin-Feng, MING Bao-Quan et al 2008 Chin. Phys. Lett. 25 2573-2576

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Abstract Lead-free piezoelectric ceramics ((Na_0.53K_0.422Li_0.048)(Nb_0.89Sb_0.06Ta_0.05)O₃ (NKLNST) + x mol SrCO₃ are prepared by conventional solid state sintering method. The specimens with pure perovskite structure show tetragonal phase at x≤0.01, and become pseudo-cubic phase at x≥0.02. A lattice parameter discontinuity is found in the specimens with 0.004≤x≤0.0075, along with a great improvement in piezoactivity. The 0.004mol SrCO₃ added NKLNST ceramics possesses outstanding performances of k_p=0.53, k_t =0.26, and d₃₃=309pC/N. Moreover, the Sr²⁺ modification inhibits the grain growth, decreases the Curie temperature, and induces a diffuse phase transition.

Keywords: 61.19.Nz 61.72.Ww 68.37.Hk 77.22.Ch 77.65.-j

Received: 02 April 2008 Published: 26 June 2008

PACS:	61.19.Nz
	61.72.Ww
	68.37.Hk	(Scanning electron microscopy (SEM) (including EBIC))
	77.22.Ch	(Permittivity (dielectric function))
	77.65.-j	(Piezoelectricity and electromechanical effects)
	77.84.Dy

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2008/V25/I7/02573

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	ZHENG Li-Mei
	WANG Jin-Feng
	MING Bao-Quan
	QI Peng
	DU Juan

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