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(K_0.5Na_0.5)NbO₃-Ba(Zn_1/3Nb_2/3)O₃ Lead-Free Ceramics: Transmittance and Microstructure

Chenwei Li, Xin Xu, Zhenlin Lu

School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, People's Republic of China.

received August 21, 2019, received in revised form November 28, 2019, accepted December 18, 2019

Vol. 2020, No. 1, Pages 36-43   DOI: 10.4416/JCST2019-00063

Abstract

Lead-free transmittance electro-optic ceramics (1 –x)(K_0.5Na_0.5)NbO₃-xBa(Zn_1/3Nb_2/3)O₃ (x = 0.03, 0.05, 0.07, 0.08, 0.09 and 0.11) (KNN-BZN) were prepared with the solid-state reaction technique. The effects of Ba(Zn_1/3Nb_2/3)O₃ dopant content on the microstructure, phase transition, optical property, and electrical properties were studied systematically. The X-ray-diffraction and Raman spectroscopy results indicated that for KNN-BZN ceramics with increasing BZN content, the crystal structure transforms from the orthorhombic phase into the pseudo-cubic phase and finally to the tetragonal phase. The KNN-BZN ceramics (0.05 mm thickness) with x = 0.07 exhibited the highest transmittance of 43.00 % in the visible spectrum, which was due to the high relative density, low porosity, uniform microstructures, and high symmetry of the pseudo-cubic structure. Moreover, ε_r, tanδ, P_r and E_c are 975.9, 0.02, 2.231 μC/cm² and 9.82 kV/cm, respectively. All of the above demonstrated that the KNN-xBZN ceramics could be promising lead-free transparent piezoceramics.

Keywords

Transparent ceramics, linear transmittance, phase structure

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