University of Oulu

Huaicheng Xiang, Chunchun Li, Heli Jantunen, Liang Fang, and Arthur E. Hill. ltralow Loss CaMgGeO4 Microwave Dielectric Ceramic and Its Chemical Compatibility with Silver Electrodes for Low-Temperature Cofired Ceramic Applications. ACS Sustainable Chemistry & Engineering 2018 6 (5), 6458-6466. DOI: 10.1021/acssuschemeng.8b00220

Ultralow loss CaMgGeO₄ microwave dielectric ceramic and Its chemical compatibility with silver electrodes for low-temperature cofired ceramic applications

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Author: Xiang, Huaicheng1,2; Li, Chunchun1,3; Jantunen, Heli2;
Organizations: 1State Key Laboratory Breeding Base of Nonferrous Metals and Specific Materials Processing, Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
2Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu FI-90014, Finland
3College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China
4State Key Laboratory Breeding Base of Nonferrous Metals and Speci fi c Materials Processing, Guangxi Universities Key Laboratory of Non-Ferrous Metal Oxide Electronic Functional Materials and Devices, College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China
5Materials and Physics Research Centre, School of Computing, Science & Engineering, University of Salford, The Crescent, Salford M5 4WT, U.K
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2018060825585
Language: English
Published: American Chemical Society, 2018
Publish Date: 2019-03-26
Description:

Abstract

A new ultralow dielectric loss cofired CaMgGeO₄ dielectric material with olivine structure was fabricated by the solid-state route. The X-ray patterns, Rietveld refinement, and microstructure revealed the characteristics of the synthesized material. CaMgGeO₄ ceramic belongs to the orthorhombic system with a Pbmn space group. Sintered at 1300 °C for 6 h, the ceramic exhibited a densification of 96.5%, an ultrahigh quality factor (Q × f) of 124 900 GHz (tan δ = 1.24 × 10–4) at a frequency of 15.5 GHz, a permittivity (εr) of 6.71, and a temperature coefficient of resonant frequency (τf) of −73.7 ppm/°C, and the average coefficient of thermal expansion of CaMgGeO₄ was 12.4 ppm/°C. The sintering temperature of the CaMgGeO₄ ceramic was reduced from 1300 to 940 °C with the addition of 5 wt % B₂O₃. The CaMgGeO₄ + 5 wt % B₂O₃ ceramics exhibited favorable microwave dielectric performances: Q × f = 102 000 GHz (at 16.4 GHz), εr = 5.80, and τf = −64.7 ppm/°C, respectively. In addition, the CaMgGeO₄ ceramic did not react with Ag electrodes, which could be advantageous in low-temperature cofired ceramic multilayer microwave devices.

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Series: ACS sustainable chemistry & engineering
ISSN: 2168-0485
ISSN-E: 2168-0485
ISSN-L: 2168-0485
Pages: 6458 - 6466
DOI: 10.1021/acssuschemeng.8b00220
OADOI: https://oadoi.org/10.1021/acssuschemeng.8b00220
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: We appreciate financial support from the Natural Science Foundation of China (Grants 51502047, 21561008, and 21761008), the Project of Scientific Research and Technical Exploitation Program of Guilin (Grants 2016010702-2 and 20170225), and the Natural Science Foundation of Guangxi Zhuang Autonomous Region (Grants 2015GXNSFFA139003, 2016GXNSFBA380134, and 2016GXNSFAA380018). Author H.X. gratefully acknowledges the Graduate School of Guilin University of Technology.
Copyright information: © 2018 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Sustainable Chemistry & Engineering, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acssuschemeng.8b00220.