Enhanced quality factor of zinc lanthanum borates-based dielectrics via the control of ZnO/B2O3 ratio

Sae Han Na Doo, Yeon Hwa Jo, Joon Seok Lee, Bhaskar C. Mohanty, Koppole C. Sekhar, Yong Soo Cho

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A dielectric system having an exceptionally high-quality factor of 1350 at 16.8 GHz is reported as a strong candidate for glass-based low-temperature cofireable materials. The dielectrics are based on unusual (16-27) ZnO·16La2O3·(57-68)B2O 3 glass mixed with a fixed 50 wt% Al2O3 filler. The ratio of ZnO/B2O3 was found to be critical in controlling the nature of glass and, consequently, performance of the dielectric mixture. For example, 27ZnO·16La2O3· 57B2O3 glass sample having the highest Zn content resulted in the lowest softening temperature of 647°C and the least porosity of ∼6%. The enhanced densification and extensive crystallization of low loss phases, i.e., LaAl2.03(B4O10)O0.54 and ZnAl2O4, are assumed to be responsible for better dielectric performance that resulted from the increase of Zn content in glass.

Original languageEnglish
Pages (from-to)334-337
Number of pages4
JournalJournal of the American Ceramic Society
Issue number2
Publication statusPublished - 2010 Feb 1


All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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