University of Oulu

Ohsato, H., Varghese, J., Vahera, T., Kim, J. S., Sebastian, M. T., Jantunen, H., & Iwata, M. (2019). Micro/Millimeter-Wave Dielectric Indialite/Cordierite Glass-Ceramics Applied as LTCC and Direct Casting Substrates: Current Status and Prospects. Journal of the Korean Ceramic Society, 56(6), 526–533.

Micro/millimeter-wave dielectric indialite/cordierite glass-ceramics applied as LTCC and direct casting substrates : current status and prospects

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Author: Ohsato, Hitoshi1,2; Varghese, Jobin1; Vahera, Timo1;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, 90014 Oulu, Finland
2Department of Research, Nagoya Industrial Science Research Institute, Nagoya 464-0819, Japan
3Department of Material Science and Engineering, Hoseo University, Asan 31499, Korea
4Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2 MB)
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Language: English
Published: Korean Ceramic Society, 2019
Publish Date: 2020-02-27


Indialite/cordierite glass-ceramics demonstrate excellent microwave dielectric properties such as a low dielectric constant of 4.7 and an extremely high quality factor Qf of more than 200 × 103 GHz when crystallized at 1300°C/20 h, which are essential criteria for application to 5G/6G mobile communication systems. The glass-ceramics applied to dielectric resonators, low-temperature co-fired ceramic (LTCC) substrates, and direct casting glass substrates are reviewed in this paper. The glass-ceramics are fabricated by the crystallization of glass with cordierite composition melted at 1550°C. The dielectric resonators are composed of crystallized glass pellets made from glass rods cast in a graphite mold. The LTCC substrates are made from indialite glass-ceramic powder crystallized at a low temperature of 1000°C/1 h, and the direct casting glass-ceramic substrates are composed of crystallized glass plates cast on a graphite plate. All these materials exhibit excellent microwave dielectric properties.

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Series: Journal of the Korean ceramic society
ISSN: 1229-7801
ISSN-E: 2234-0491
ISSN-L: 1229-7801
Volume: 56
Issue: 6
Pages: 526 - 533
DOI: 10.4191/kcers.2019.56.6.01
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
216 Materials engineering
Funding: The authors would like to thank Professors Hirotaka Ogawa and Akinori Kan of Meijo University for facilitating the measurement of material properties, President Sadahiko Suzuki of Marusu Glaze Co., Ltd. and President Masato Mitsumatsu and Director Kenji Ito of the Seto Ceramic Research Institute for the preparation of the indialite/ cordierite glass-ceramics. This work was supported by JSPS KAKENHI Grant Number JP16K06735, Nokia Visiting Professors Project 201700003 for Visiting Professor Hitoshi Ohsato, and European Research Council Project No. 24001893 for Professor Heli Jatunen and Dr. Jobin Varghese.
Copyright information: © 2019 Korean Ceramic Society. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.