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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

Journal of Ceramic Science and Technology, Vol. 11, No. 1 (2020), pp. 36-43

DOI: 10.4416/JCST2019-00063

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Abstract

Lead-free transmittance electro-optic ceramics (1 –x)(K0.5Na0.5)NbO3-xBa(Zn1/3Nb2/3)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(Zn1/3Nb2/3)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, εr, tanδ, Pr and Ec 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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