Hot-pressed K0.48Na0.52Nb1-xBixO3 (x=0.05-0.15) lead-free ceramics for electro-optic applications

被引:49
作者
Li, Kun [1 ]
Li, Fa Liang [2 ]
Wang, Yu [2 ]
Kwok, Kin Wing [2 ]
Chan, Helen Lai Wa [2 ]
机构
[1] Changzhou Univ, Sch Mat Sci & Engn, Changzhou 213016, Jiangsu, Peoples R China
[2] Hong Kong Polytech Univ, Dept Appl Phys & Mat Res Ctr, Kowloon, Hong Kong, Peoples R China
关键词
Transparent ceramics; Lead-free; Electro-optic; Sodium potassium niobate; Hot-pressing; POTASSIUM-SODIUM NIOBATE; STATE CRYSTAL-GROWTH; PIEZOELECTRIC PROPERTIES; FERROELECTRIC PROPERTIES; ELECTRICAL-PROPERTIES; SINGLE-CRYSTALS; MICROSTRUCTURE;
D O I
10.1016/j.matchemphys.2011.09.048
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Bismuth-modified potassium sodium niobate K0.48Na0.52Nb1-xBixO3 (x = 0.05-0.15) transparent lead-free ceramics were fabricated by a hot-pressing method. Both hot-pressing conditions (pressure, temperature and duration) and Bi-content were found to have strong influences on the density, transparency, electro-optical coefficient, and electrical properties of the ceramics. Under the typical hot-pressing conditions of 1060 degrees C for 5 h at 5.5 MPa, the optimum Bi-content was found at 7.5 at.% in the system under study. These ceramics display good optical transmission in the visible and particularly in the infrared regions. For visible light, the highest transmission value of a polished 0.5-mm thick plates is about 60% at a wavelength of 800 nm; while for infrared, the transmission value is about 80% at 4000 nm. The effective linear electro-optic coefficient of the ceramics was found to be 42 pV m(-1). The dielectric permittivity and loss tangent of the KNNB (x = 0.075) ceramics were found to be 716 and 0.031 at room temperature. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:320 / 324
页数:5
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