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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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