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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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Low-Temperature Sintering and Microwave Dielectric Properties of Li2O-3ZnO-5TiO2 Ceramics Doped with B2O3

J. Liu1, J. Zhu1,2, Y. Zeng2

1 College of Optoelectronic Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China
2 Shenzhen Zhenhua Fu Electronics Co., Ltd., Shenzhen, Guangdong 518109, China

received July 8, 2019, received in revised form August 9, 2019, accepted August 14, 2019

Vol. 10, No. 2, Pages 1-8   DOI: 10.4416/JCST2019-00055

Abstract

Phase composition, crystal structure as well as microwave dielectric properties of Li2O-3ZnO-5TiO2 ceramics (LZT135, for short) with the addition of B2O3 and TiO2 were investigated. X-ray diffraction (XRD) and energy-dispersive spectroscopy (EDS) results revealed that the samples with added B2O3 and sintered at 900 °C had formed solid solutions with a similar crystal structure to Zn2Ti3O8. When 0.25 wt% B2O3 was added, LZT135 ceramics could be densified at about 900 °C, while the negative τf value of about -31.5 ppm/K restricted its applications. TiO2 was added for further adjustment of the τf value of LZT135 ceramics. Finally, with the addition of 0.25 wt% B2O3 and 9 wt% TiO2, near zero τf values of about -0.5 ppm/K can be achieved for LZT135 ceramics, and at the same time, high Qf values of about 48 300 GHz are attractive for low-temperature co-firing ceramics technology.

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Keywords

Microwave dielectric properties, LTCC, Li2O-3ZnO-5TiO2

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