Back to Search
Start Over
Synthesis and microwave dielectric properties of Bi 2 Ge 3 O 9 ceramics for application as advanced ceramic substrate
- Source :
- Journal of the European Ceramic Society. 37:605-610
- Publication Year :
- 2017
- Publisher :
- Elsevier BV, 2017.
-
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: er = 9.7, Q × f = 48,573 GHz and τf = −29.5 ppm/°C.
- Subjects :
- 010302 applied physics
Secondary phase
Materials science
Microwave dielectric properties
02 engineering and technology
021001 nanoscience & nanotechnology
Microstructure
01 natural sciences
Grain size
law.invention
Ceramic substrate
law
visual_art
Phase (matter)
0103 physical sciences
Materials Chemistry
Ceramics and Composites
visual_art.visual_art_medium
Calcination
Ceramic
Composite material
0210 nano-technology
Subjects
Details
- ISSN :
- 09552219
- Volume :
- 37
- Database :
- OpenAIRE
- Journal :
- Journal of the European Ceramic Society
- Accession number :
- edsair.doi...........a45f377f3f8b7298ed02b58b7288757b