Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/17514
Title: Hot-pressed K0.48Na0.52Nb1-xBixO3 (x = 0.05-0.15) lead-free ceramics for electro-optic applications
Authors: Li, K
Li, FL
Wang, Y 
Kwok, KW 
Chan, HLW 
Keywords: Electro-optic
Hot-pressing
Lead-free
Sodium potassium niobate
Transparent ceramics
Issue Date: 2011
Publisher: Elsevier
Source: Materials chemistry and physics, 2011, v. 131, no. 1-2, p. 320-324 How to cite?
Journal: Materials chemistry and physics 
Abstract: Bismuth-modified potassium sodium niobate K 0.48Na 0.52Nb 1-xBi xO 3 (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, electrooptical coefficient, and electrical properties of the ceramics. Under the typical hot-pressing conditions of 1060 °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 pVm -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.
URI: http://hdl.handle.net/10397/17514
ISSN: 0254-0584
EISSN: 1879-3312
DOI: 10.1016/j.matchemphys.2011.09.048
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