University of Oulu

Yin C, Xiang H, Li C, Porwal H, Fang L. Low‐temperature sintering and thermal stability of Li2GeO3‐based microwave dielectric ceramics with low permittivity. J Am Ceram Soc. 2018;101:4608–4614. https://doi.org/10.1111/jace.15723

Low‐temperature sintering and thermal stability of Li₂GeO₃‐based microwave dielectric ceramics with low permittivity

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Author: Yin, Changzhi1; Xiang, Huaicheng1,2; Li, Chunchun1;
Organizations: 1Guangxi Universities Key Laboratory of Non-ferrous Metal Oxide Electronic Functional Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, China
2Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
3School of Engineering and Material Science, Queen Mary University of London, London, UK
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2018082934304
Language: English
Published: John Wiley & Sons, 2018
Publish Date: 2019-04-25
Description:

Abstract

A low‐permittivity dielectric ceramic Li₂GeO₃ was prepared by the solid‐state reaction route. Single‐phase Li₂GeO₃ crystallized in an orthorhombic structure. Dense ceramics with high relative density and homogeneous microstructure were obtained as sintered at 1000‐1100°C. The optimum microwave dielectric properties were achieved in the sample sintered at 1080°C with a high relative density ~ 96%, a relative permittivity εr ~ 6.36, a quality factor Q × f ~ 29 000 GHz (at 14.5 GHz), and a temperature coefficient of resonance frequency τf ~ −72 ppm/°C. The sintering temperature of Li₂GeO₃ was successfully lowered via the appropriate addition of B₂O₃. Only 2 wt.% B₂O₃ addition contributed to a 21.2% decrease in sintering temperature to 850°C without deteriorating the dielectric properties. The temperature dependence of the resonance frequency was successfully suppressed by the addition of TiO₂ to form Li₂TiO₃ with a positive τf value. These results demonstrate potential applications of Li₂GeO₃ in low‐temperature cofiring ceramics technology.

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Series: Journal of the American ceramic society
ISSN: 0002-7820
ISSN-E: 1551-2916
ISSN-L: 0002-7820
Volume: 101
Issue: 10
Pages: 4608 - 4614
DOI: 10.1111/jace.15723
OADOI: https://oadoi.org/10.1111/jace.15723
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: Natural Science Foundation of China, Grant/Award Number: 51502047, 21561008, 21761008; Natural Science Foundation of Guangxi Zhuang Autonomous Region, Grant/Award Number: 2015GXNSFFA139003, 2016GXNSFBA380134, 2016GXNSFAA380018; Project of Scientific Research and Technical Exploitation Program of Guilin, Grant/Award Number: 2016010702-2, 20170225; Scholarship Fund of Guangxi Education Department.
Copyright information: © 2018 The American Ceramic Society. This is the peer reviewed version of the following article: Yin C, Xiang H, Li C, Porwal H, Fang L. Low‐temperature sintering and thermal stability of Li2GeO3‐based microwave dielectric ceramics with low permittivity. J Am Ceram Soc. 2018;101:4608–4614. https://doi.org/10.1111/jace.15723, which has been published in final form at https://doi.org/10.1111/jace.15723. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.