Calcium Aluminoborosilicate-Based Dielectrics Containing CaCu3Ti4O12 as a Filler
Abstract:High dielectric constant (k) CaCu3Ti4O12 (CCTO) has been studied as a potential filler for low-temperature cofired ceramics (LTCC) based on typical calcium aluminoborosilicate glass. CCTO does not appear to be chemically reactive with the glass regardless of the firing temperature over the compositional range of 30–90 wt% CCTO. Dielectric constant and dielectric loss turned out to depend strongly on the relative content of CCTO and firing temperature. As an optimal composition, the glass with 60 wt% CCTO exhibited a k∼32 and tan ∼0.01 as a result of firing at 850°C, which is preferably applicable for the medium k LTCC applications. The higher content of 90 wt% CCTO needed to be densified at 900°C for better densification with a higher dielectric constant of ∼150. However, the 900°C firing was not acceptable for the 30 and 60 wt% CCTO-containing samples due to the unexpected expansion of samples leading to significantly enlarged pores.
Document Type: Research Article
Affiliations: 1: Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea 2: Korea Institute of Ceramic Engineering and Technology, Seoul 153-801, Korea 3: Korea Testing Laboratory, Machinery and Material Testing Center, Seoul 152-718, Korea
Publication date: August 1, 2010