University of Oulu

Zhiwei Zhang, Liang Fang, Huaicheng Xiang, Minyu Xu, Ying Tang, Heli Jantunen, Chunchun Li, Structural, infrared reflectivity spectra and microwave dielectric properties of the Li7Ti3O9F ceramic, Ceramics International, Volume 45, Issue 8, 2019, Pages 10163-10169, ISSN 0272-8842, https://doi.org/10.1016/j.ceramint.2019.02.065

Structural, infrared reflectivity spectra and microwave dielectric properties of the Li₇Ti₃O₉F ceramic

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Author: Zhang, Zhiwei1; Fang, Liang1,2; Xiang, Huaicheng1;
Organizations: 1Guangxi Key Laboratory of Optical and Electronic Materials and Devices, College of Material Science and Engineering, Guilin University of Technology, Guilin, 541004, China
2College of Materials and Chemical Engineering, China Three Gorges University, Yichang, 443002, China
3Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P. O. BOX 4500, FI-90014, Oulu University, Finland
4College of Information Science and Engineering, Guilin University of Technology, Guilin, 541004, China
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2019052116350
Language: English
Published: Elsevier, 2019
Publish Date: 2021-06-01
Description:

Abstract

A cubic rock salt structured ceramic, Li₇Ti₃O₉F, was fabricated via the conventional solid-state reaction route. The synthesis conditions, sintering characteristics, and microwave dielectric properties of Li₇Ti₃O₉F ceramics were investigated by X-ray diffraction (XRD), thermal dilatometer, Scanning Electron Microscopy (SEM) accompanied with EDS mapping, and microwave resonant measurements. Rietveld refinement, selected area electron diffraction (SAED) pattern and high-resolution transmission electron microscopy (HRTEM) confirmed that Li₇Ti₃O₉F adopts a cubic rock-salt structure. The ceramic sintered at 950 °C presented the optimal microwave properties of εᵣ = 22.5, Q×f = 88,200 GHz, and τf  = −24.2 ppm/°C. Moreover, good chemical compatibility with Ag was verified through cofiring at 950 °C for 2 h. These results confirm a large potential for Li₇Ti₃O₉F ceramic to be utilized as substrates in the low temperature cofired ceramic (LTCC) technology. This work provides the possibility to exploit low-temperature-firing ceramics through solid solution between oxides and fluorides.

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Series: Ceramics international
ISSN: 0272-8842
ISSN-E: 1873-3956
ISSN-L: 0272-8842
Volume: 45
Issue: 8
Pages: 10163 - 10169
DOI: 10.1016/j.ceramint.2019.02.065
OADOI: https://oadoi.org/10.1016/j.ceramint.2019.02.065
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
213 Electronic, automation and communications engineering, electronics
Subjects:
Funding: This work was supported by the Natural Science Foundation of China (Nos. 21561008, 51502047 and 21761008), the Natural Science Foundation of Guangxi Zhuang Autonomous Region (Nos. 2015GXNSFFA139003, 2016GXNSFBA380134, 2016GXNSFAA380018, 2018GXNSFAA281253, and 2018GXNSFAA138175), and Project of Scientific Research and Technical Exploitation Program of Guilin (20170225).
Copyright information: © 2019 Published by Elsevier Ltd. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
  https://creativecommons.org/licenses/by-nc-nd/4.0/