Structural and dielectric properties of B2O3/Li2O-added Ba0.6Sr0.4TiO3 multilayer ceramics for tunable devices
- Authors
- Lee, Woong-Hee; Im, Mir; Choi, Boo-Hyun; Kweon, Sang-Hyo; Jo, Sora; Sanghadasa, Mohan; Nahm, Sahn
- Issue Date
- 15-2월-2020
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Ba0.6Sr0.4TiO3; Low temperature co-fired ceramic; Tape casting; Multilayer ceramics; Tunable device
- Citation
- CERAMICS INTERNATIONAL, v.46, no.3, pp.2640 - 2647
- Indexed
- SCIE
SCOPUS
- Journal Title
- CERAMICS INTERNATIONAL
- Volume
- 46
- Number
- 3
- Start Page
- 2640
- End Page
- 2647
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/57651
- DOI
- 10.1016/j.ceramint.2019.09.248
- ISSN
- 0272-8842
- Abstract
- B2O3 and Li2O (B/L)-added Ba0.6Sr0.4TiO3 (BST) ceramics sintered at 940 degrees C exhibited a dense microstructure with large grains. The amount of B/L additive was 4.5 wt% with a B/L ratio of 1.5:1. The B/L-related liquid phase assisted the densification of the BST ceramics. This BST ceramic displayed a large dielectric constant (epsilon(r)) of 2834 with a low dielectric loss (tan delta) of 0.21% at 1.0 MHz. It also displayed a large tunability (28.2% at 10 kV/cm) and a high figure of merit (FOM) of 134. BST thick-films were synthesized using the tape casting method. The thick-film densified at 940 degrees C exhibited a large tunability of 18.7% at 10.0 kV/cm and an FOM of 208; these are higher than the values reported in the literature. Multilayer ceramics (MLCs) consisting of five layers of 40-mu m-thick BST thick-films and Ag electrodes were also fabricated at 940 degrees C. No diffusion occurred between the Ag electrode and BST thick-film. A large tunability of 67.6% at 52 kV/cm with a high FOM of 294 was obtained from this MLC. This verified that the B/L-added BST ceramic is effective for application in tunable multilayer devices.
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