Chemical stability and dielectric properties of RO-La 2 O 3 -B 2 O 3 (R = Ca, Mg, Zn)-based ceramics

Yeon Hwa Jo, Min Soo Kang, Kyung Won Chung, Yong Soo Cho

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19 Citations (Scopus)

Abstract

New lanthanum borate (La 2 O 3 -B 2 O 3 ) glasses modified with divalent oxides, such as CaO, MgO and ZnO were investigated as potential low temperature dielectrics by understanding compositional dependence of dielectric properties and chemical leaching resistance. Firing behavior, such as densification and crystallization, depended strongly on the glass composition and is found to influence the resultant dielectric performance. Specifically, the dielectric composition of 20ZnO-20La 2 O 3 -60B 2 O 3 glass with 40 wt% Al 2 O 3 as a filler showed distinct enhancements of dielectric properties, i.e., k ∼ 8.3 and Q ∼ 1091 at the resonant frequency of 17.1 GHz, as a result of 850 °C firing. The result was believed related to earlier densification and unexpected evolvements of ZnAl 2 O 4 and La(BO 2 ) 3 phases during firing. The Mg-containing glass sample was most stable in strong acid solutions and did not show any significant changes in microstructure even after 300 min exposure. The Ca-containing glass sample was not regarded as a promising candidate for low temperature dielectrics from the observed low quality factor and weak chemical durability.

Original languageEnglish
Pages (from-to)361-369
Number of pages9
JournalMaterials Research Bulletin
Volume43
Issue number2
DOIs
Publication statusPublished - 2008 Feb 5

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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