Synthesis and microwave dielectric properties of Bi2Ge3O9 ceramics for application as advanced ceramic substrate

Title
Synthesis and microwave dielectric properties of Bi2Ge3O9 ceramics for application as advanced ceramic substrate
Authors
윤석진강종윤남산Xing-Hua Ma권상효김영식
Keywords
Bi2Ge3O9 ceramics; LTCC; Microwave dielectric properties; Advanced ceramic substrates
Issue Date
2017-02
Publisher
Journal of the European Ceramic Society
Citation
VOL 37, NO 2-610
Abstract
During the synthesis of Bi2Ge3O9 ceramics using Bi2O3 + 3GeO2 powders, the Bi4Ge3O12 phase was formed at low temperature (≤800 °C). Bi4Ge3O12 preferentially adopted GeO2-excess phase, and this phase was consistently present in the sintered Bi2Ge3O9 ceramic as a secondary phase. Therefore, Bi4Ge3O12 powder was first calcined and subsequently reacted with GeO2 powder to obtain the pure Bi2Ge3O9 ceramic through the following reaction: 1/2Bi4Ge3O12 + 3/2GeO2 → Bi2Ge3O9. Formation of the Bi2Ge3O9 phase was initiated at temperature of 850 °C. The pure Bi2Ge3O9 ceramic sintered at 875 °C for 8 h had a dense microstructure with an average grain size of 2.7 μm. Furthermore, the pure Bi2Ge3O9 ceramic exhibited promising microwave dielectric properties for the advanced ceramic substrate: εr = 9.7, Q × f = 48,573 GHz and τf = − 29.5 ppm/°C.
URI
http://pubs.kist.re.kr/handle/201004/66019
ISSN
0955-2219
Appears in Collections:
KIST Publication > Article
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