Abstract
The effect of Zn-B-O (ZB) glass additions on the sintering temperature and microwave dielectric properties of BaTi4O9 has been investigated using X-ray diffraction, scanning electron microscopy, dilatometry and electrical characterization. It was found that the addition of small amount of glass to BaTi4O9 lowered the sintering temperature to ∼900°C while maintaining good microwave properties. In sintered samples with ZB glass, plate-like abnormal grains (∼5 μm) were observed. ZB glass heat-treated at 900°C for 2 h was crystallized to Zn(BO2)2 and Zn3(BO3)2, which coincides with second phases detected in low-temperature fired BaTi4O9. Thus it can be concluded that there is a negligible reaction forming other second phases between BaTi4O9 and ZB glass. BaTi4O9 ceramics sintered at 900°C for 2 h had good microwave dielectric properties: relative dielectric constant (εr) = 33, quality factor (Qxf) = 27000, and temperature coefficient of resonant frequency (τf) = 7 ppm/°C.
Original language | English |
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Pages (from-to) | 585-595 |
Number of pages | 11 |
Journal | Materials Research Bulletin |
Volume | 36 |
Issue number | 3-4 |
DOIs | |
Publication status | Published - 2001 Feb |
Externally published | Yes |
Keywords
- A. Ceramics
- A. Glasses
- C. Electron microscopy
- C. X-ray diffraction
- D. Dielectric properties
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering