Tetragonal-to-Tetragonal Phase Transition in Lead-Free (KxNa1−x)NbO3 (x = 0.11 and 0.17) Crystals
Dabin Lin,
Zhenrong Li,
Fei Li,
Changlong Cai,
Weiguo Liu,
Shujun Zhang
Affiliations
Dabin Lin
Laboratory of Thin Film Techniques and Optical Test, Xi'an Technological University, Xi'an 710032, Shaanxi, China
Zhenrong Li
Electronic Materials Research Laboratory, Key Laboratory of Education Ministry/International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
Fei Li
Electronic Materials Research Laboratory, Key Laboratory of Education Ministry/International Center for Dielectric Research, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
Changlong Cai
Laboratory of Thin Film Techniques and Optical Test, Xi'an Technological University, Xi'an 710032, Shaanxi, China
Weiguo Liu
Laboratory of Thin Film Techniques and Optical Test, Xi'an Technological University, Xi'an 710032, Shaanxi, China
Shujun Zhang
Materials Research Institute, the Pennsylvania State University, University Park, PA 16802, USA
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.
