Abstract
The sintering behavior, microstructure and microwave dielectric properties of complex pyrophosphate compounds AMP2O7 (A = Ca, Sr; M = Zn, Cu) were investigated in this paper. All compounds could be densified below the temperature of 950 °C without any glass addition, and exhibit low permittivity (εr < 8), high Q × f value and negative temperature coefficient of resonant frequency. The Q × f value was discussed from the point of view of bond strength. The chemical compatibility with silver and copper was also investigated. All compounds seriously react with silver at ∼700 °C. However SrZnP2O7 could be co-fired with copper in reduced atmosphere. The microwave dielectric properties of SrZnP2O7 sintered at 950 °C in reducing atmosphere are: εr = 7.06, Q × f = 52781 GHz, τf = -70 ppm/°C. In terms of its lower sintering temperature, chemical compatibility with copper and good microwave dielectric properties, SrZnP2O 7 ceramic is very promising for low temperature co-fired ceramic (LTCC) applications.
Original language | English |
---|---|
Pages (from-to) | 2120-2129 |
Number of pages | 10 |
Journal | Materials Research Bulletin |
Volume | 40 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2005 Dec 8 |
Externally published | Yes |
Keywords
- A. Ceramics
- D. Dielectric properties
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering