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

Crystals

Dabin Lin¹  Zhenrong Li²  Fei Li²  Changlong Cai¹  Weiguo Liu¹ 

[1]Laboratory of Thin Film Techniques and Optical Test, Xi’an Technological University, Xi’an 710032, Shaanxi, China

[2] E-Mails:

[3]Electronic Materials Research Laboratory, Key Laboratory of Education Ministry/International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, Shaanxi, China

[4] E-Mail:

关键词: lead free piezoelectric crystal;    phase transitions;    domain structure;   

DOI  :  10.3390/cryst4020113

来源: mdpi

【 摘 要 】

Lead free piezoelectric crystals of (K_xNa_1−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 (K_xNa_1−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 (K_0.11Na_0.89)NbO₃ crystals exhibited tetragonal to tetragonal and tetragonal to cubic phase transitions temperatures at 405 °C and 496 °C, respectively.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.