University of Oulu

Hitoshi OHSATO, Practicing applied mineralogy on the electroceramics—Examples: microwave and millimeter-wave dielectrics, Japanese Magazine of Mineralogical and Petrological Sciences, 2018, Volume 47, Issue 1, Pages 43-50, Released March 21, 2018, Online ISSN 1349-7979, Print ISSN 1345-630X,

エレクトロセラミックスに於ける応用鉱物学の実践―マイクロ波/ミリ波誘電体を例に = Practicing applied mineralogy on the electroceramics : examples: microwave and millimeter-wave dielectrics

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Author: Ohsato, Hitoshi1,2
Organizations: 1Nagoya Industrial Science Research Institute
2University of Oulu, Microelectronics Research Unit
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 3.5 MB)
Persistent link:
Language: Japanese
Published: Japan Association of Mineralogical Sciences, 2018
Publish Date: 2019-05-21


The author and his coleage have been studying electroceramics based on the applied mineralogy. The mineralogy has long history and has been the origin of all science. The material science is also based on the mineralogy. The author studied crystal structure analysis at the Mineralogical School of the University of Tokyo, and material science at the Department of Ceramics of Nagoya Institute of Technology, so he applied mineralogy to material science. He has been studying in following area: microwave dielectrics, millimeter-wave dielectrics, multilayer ceramic condenser, piezoelectric materials and so on. In this paper, pseudo-tungstenbronze dielectrics and homologous compound series on the microwave dielectrics and indialite/cordierite glass ceramics on the millimeter-wave dielectrics has been reviewed. The pseudo-tungstenbronze solid solutions have special point of x = 2/3 on the Ba₆₋₃xR₈+₂ₓTi₁₈O₅₄ (R = rare earth) that is the compositional ordering performed high quality factor based on the relationship between crystal structure and properties. Based on the knowledge of high Qf due to compositional ordering, new dielectrics with high Qf had been designed. On the homologous compounds, the relationship between the Qf properties and crystal structure due to substitute large cataion has been clarified for the design of base station resonator. On the millimeter-wave dielectrics, indialite glass ceramics are presented, which has low dielectric constant of 4.7 and extremely high Qf of more than 200 × 10³ GHz. It will be applied for resonators, patch antennas and LTCC substrates. The other materials such as multilayer capacitors and piezoelectric materials will be reviewed near future.

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Series: Japanese magazine of mineralogical and petrological sciences
ISSN: 1345-630X
ISSN-E: 1349-7979
ISSN-L: 1345-630X
Volume: 47
Issue: 1
Pages: 43 - 50
DOI: 10.2465/gkk.171222
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
213 Electronic, automation and communications engineering, electronics
Copyright information: © 2018 Japan Association of Mineralogical Sciences. This is a post-peer-review, pre-copyedit version of an article published in Japanese Magazine of Mineralogical and Petrological Sciences Vol. 47 issue 1. The final authenticated version is available online at: