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Journal of Materials Science: Materials in Electronics

, Volume 29, Issue 17, pp 14835–14841 | Cite as

Ultra-low temperature fired glass-free Li2O–MO–WO3 (M = Co, Ni, Ca, Ba) microwave dielectric ceramics

  • Ching-Fang Tseng
  • Cheng-Hung Chiang
  • Po-Hsien Chen
  • Shun-Yu Chang
  • Tai-Lun Chuang
Article

Abstract

The Li2O–MO–WO3 (M = Co, Ni, Ca, Ba) ceramics for ultra-low temperature co-fired ceramic application were prepared by using the conventional solid-state reaction route. The phase composition, microstructures, and microwave dielectric properties of the compounds were investigated systematically. The X-ray diffraction patterns show that the Li2O–MO–WO3 (M = Co, Ni) consist of CoWO4 (NiWO4), Li2WO4 and Li2W2O7 phases while Li2O–MO–WO3 (M = Ca, Ba) comprises CaWO4 (BaWO4) and Li2WO4 phases. The porosity and phase constitution acted as a controlling factor of dielectric constant in the Li2O–MO–WO3 (M = Co, Ni, Ca, Ba) ceramics. These compounds can be sintered at ultra-low temperature of 600–680 °C and exhibit good microwave dielectric properties with εr = 5.6–13.5, Q × f = 13,000–25,000 GHz, and τf =− 97.3 to − 38.3 ppm/°C, which made the compounds promising for multilayer ultra-low temperature cofiring dielectrics application.

Notes

Acknowledgements

This work was sponsored by the Ministry of Science and Technology of the Republic of China under Grant MOST 104-2221-E-239 -008.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Ching-Fang Tseng
    • 1
  • Cheng-Hung Chiang
    • 1
  • Po-Hsien Chen
    • 1
  • Shun-Yu Chang
    • 1
  • Tai-Lun Chuang
    • 1
  1. 1.Department of Electronic EngineeringNational United UniversityMiao-LiTaiwan

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