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The sintering behavior and physical properties of Li2CO3-doped Bi0.5(Na0.8K0.2)0.5TiO3 lead-free ceramics

Le Dai Vuong and Nguyen Truong Tho


In this study, Li2CO3-doped Bi0.5(Na0.8K0.2)0.5TiO3 (BNKT) ceramics were fabricated via the conventional solid-state reaction using ultrasound waves for preliminary milling. The milling time was shortened from 20 h to 1 h with ball milling. The phase structure of BNKT investigated by X-ray diffraction showed a single perovskite phase. With increasing Li2CO3 content, the phase structure of the ceramics changed from rhombohedral to tetragonal. At a sintering temperature of 1100 °C and Li2CO3 content of 0.4 wt.%, the best physical properties of the ceramics, such as density (ρ), 5.9 g cm−3; electromechanical coupling factors (kp), 0.32; (kt), 0.29; remanent polarization (Pr), 12.0 μC cm−2; dielectric constant (r), 1 191; and highest dielectric constant (max), 5 800, were obtained.

*Correspondence address, Le Dai Vuong, Faculty of Chemical and Environmental Engineering, Hue Industrial College, 70 Nguyen Hue Str., Hue City, Vietnam, Tel.: +84888000858, E-mail:


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Received: 2016-07-09
Accepted: 2016-10-12
Published Online: 2017-02-22
Published in Print: 2017-03-13

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