Phase Structures of (K0.48Na0.52)0.945Li0.055Sb0.05Nb0.95O3 Piezoceramics

doi:10.1088/0256-307X/27/1/017701

Chin. Phys. Lett.

2010, Vol. 27

Issue (1): 017701 DOI: 10.1088/0256-307X/27/1/017701

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

Phase Structures of (K_0.48Na_0.52)_0.945Li_0.055Sb_0.05Nb_0.95O₃ Piezoceramics

ZANG Guo-Zhong, YI Xiu-Jie, XU Zhi-Jun, FU Peng, ZHAO Li-Min, PU Xi-Peng

School of Materials Science and Engineering, Liaocheng University, Liaocheng 252059

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ZANG Guo-Zhong, YI Xiu-Jie, XU Zhi-Jun et al 2010 Chin. Phys. Lett. 27 017701

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Abstract The phase structures of lead-free (K0.48Na0.52)0.945Li0.055Sb0.05Nb0.95O3 piezoceramics are studied based on the measurements of ferroelectric and dielectric properties as well as the analyses of x-ray diffraction pattern and energy dispersive spectroscopy. The poled samples exhibit orthorhombic structure whereas the surface and interior for unpoled samples exhibit tetragonal and tetragonal-orthorhombic coexistent structures, respectively. These results are in agreement with the relative permittivity-temperature curves and demonstrate that phase transitions can be induced by Na volatilization and poling process. The remnant polarization Pr measured at 20°C increases continuously with the increase of electric field in the range of 2000-4000V/mm. This indicates that the polymorphic structure is more beneficial to the rotation or reorientation of dipoles than either the orthorhombic or the tetragonal structure. The randomly oriented domains may be the essential reason for the continuous rotation or reorientation and not good thermal stability.

Keywords: 77.80.Bh 77.22.Ch 77.84.Dy

Received: 03 June 2009 Published: 30 December 2009

PACS:	77.80.Bh
	77.22.Ch	(Permittivity (dielectric function))
	77.84.Dy

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https://cpl.iphy.ac.cn/10.1088/0256-307X/27/1/017701 OR https://cpl.iphy.ac.cn/Y2010/V27/I1/017701

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	ZANG Guo-Zhong
	YI Xiu-Jie
	XU Zhi-Jun
	FU Peng
	ZHAO Li-Min
	PU Xi-Peng

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