New lanthanum borate (La2O3-B2O3) 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-20La2O3-60B2O3 glass with 40 wt% Al2O3 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 ZnAl2O4 and La(BO2)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.
|Number of pages||9|
|Journal||Materials Research Bulletin|
|Publication status||Published - 2008 Feb 5|
Bibliographical noteFunding Information:
The authors would like to acknowledge the TIC center of University of Suwon for assistance in obtaining the microwave dielectric data. This work is supported by Korea Energy Management Corporation (KEMCO) through a research project.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering