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Journal of Ceramic Science and Technology

The Journal of Ceramic Science and Technology publishes original scientific articles on all topics of ceramic science and technology from all ceramic branches. The focus is on the scientific exploration of  the relationships between processing, microstructure and properties of sintered ceramic materials as well as on new processing routes for innovative ceramic materials. The papers may have either theoretical or experimental background. A high quality of publications will be guaranteed by a thorough double blind peer review process.

The Journal is published by Göller Verlag GmbH on behalf of the Deutsche Keramische Gesellschaft (DKG). Edited by Yu-Ping Zeng, Shanghai Institute of Ceramics, Chinese Academy of Sciences, China.

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Effect of Calcination Temperature on the Structural and Electrical Properties of Low-Temperature-Sintered (Na0.52K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3 Ceramics

D.Y. Lv, Z. Liu, W.W. Jin, Z. Ye, F. Hua, K. Wu

Institute of Materials Science, Wuhu Institute of Technology, Wuhu, 241003, Anhui, P.R. China

received January 30, 2020, received in revised form July 29, 2020, accepted August 9, 2020

Vol. 11, No. 2, Pages 99-102   DOI: 10.4416/JCST2020_00011

Abstract

Low-temperature-sintered lead-free 1.5 mol%-Na2O-excess (Na0.52K0.44Li0.04)(Nb0.88Sb0.08Ta0.04)O3 (NKN-LST) ceramics were calcined at 500 ∼ 950 °C. At 500 °C, a perovskite structure of the calcined powders without crystallinity was obtained. As the calcination temperature increased, an orthogonal structure began to form. And at 750 °C, the NKN-LST powders have a single orthogonal structure. The NKN-LST powders form a tetragonal structure when the calcination temperature ≥ 800 °C. Therefore, in the calcination temperature range of 800 ∼ 900 °C, the NKN-LST powders have two orthogonal and tetragonal structures. However, it can be seen that a two-phase coexistence zone of orthogonal and tetragonal structure exists in all the ceramics sintered in air at 1 020 °C for 3 h. Moreover, with increasing calcination temperature, the tetragonal phase increases. There is also an increase in the abnormal grains with increasing the calcination temperature, which may be attributable to a decrease in the critical driving force. At the same time, it has been found that the composition and structure determine the properties of NKN-LST ceramics. The optimum electrical properties of NKN-LST ceramics with a d33 of 384 pC/N, a kp of 0.53, and an ε33T of 2 735, were obtained when the ceramics were calcined at 700 °C. These properties indicated that the ceramics studied have the potential to replace lead-based ceramics in device applications. Therefore, the reduction of the calcination temperature leads to a significant improvement of 1.5 mol%-Na2O-excess NKN-LST piezoelectric ceramics.

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Keywords

Lead-free piezoelectric ceramics, low-temperature sintering, calcination, electrical properties

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