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Crystals 2014, 4(2), 113-122; doi:10.3390/cryst4020113
Article

Tetragonal-to-Tetragonal Phase Transition in Lead-Free (KxNa1−x)NbO3 (x = 0.11 and 0.17) Crystals

1
,
2,* , 2
,
1
,
1
 and
3,*
1 Laboratory of Thin Film Techniques and Optical Test, Xi'an Technological University, Xi'an 710032, Shaanxi, China 2 Electronic Materials Research Laboratory, Key Laboratory of Education Ministry/International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China 3 Materials Research Institute, the Pennsylvania State University, University Park, PA 16802, USA
* Authors to whom correspondence should be addressed.
Received: 13 April 2014 / Revised: 16 May 2014 / Accepted: 16 May 2014 / Published: 10 June 2014
(This article belongs to the Special Issue Piezoelectric Crystals)
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Abstract

Lead free piezoelectric crystals of (KxNa1−x)NbO3 (x = 0.11 and 0.17) have been grown by the modified Bridgman method. The structure and chemical composition of the obtained crystals were determined by X-ray diffraction (XRD) and electron probe microanalysis (EPMA). The domain structure evolution with increasing temperature for (KxNa1−x)NbO3 (x = 0.11 and 0.17) crystals was observed using polarized light microscopy (PLM), where distinguished changes of the domain structures were found to occur at 400 °C and 412 °C respectively, corresponding to the tetragonal to tetragonal phase transition temperatures. Dielectric measurements performed on (K0.11Na0.89)NbO3 crystals exhibited tetragonal to tetragonal and tetragonal to cubic phase transitions temperatures at 405 °C and 496 °C, respectively.
Keywords: lead free piezoelectric crystal; phase transitions; domain structure lead free piezoelectric crystal; phase transitions; domain structure
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Lin, D.; Li, Z.; Li, F.; Cai, C.; Liu, W.; Zhang, S. Tetragonal-to-Tetragonal Phase Transition in Lead-Free (KxNa1−x)NbO3 (x = 0.11 and 0.17) Crystals. Crystals 2014, 4, 113-122.

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