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Improvement of Microwave Dielectric Characteristics in SrLaAlO.
- Source :
-
Journal of the American Ceramic Society . Dec2010, Vol. 93 Issue 12, p4066-4070. 5p. 1 Black and White Photograph, 7 Graphs. - Publication Year :
- 2010
-
Abstract
- The improvement in microwave dielectric characteristics by Ca substitution in SrLaAlO4 ceramics together with the stability of K2NiF4 structure were investigated. X-ray diffraction analysis and the scattering electron images combined with EDS analysis indicated that the matrix phase was a solid solution with a composition represented by the chemical formula Sr1-xCaxLaAlO4 in the entire range of 0≤x≤0.9, and minor amount of LaAlO3 secondary phase was detected only in the composition of x = 0.8 and 0.9. The relative permittivity increased slightly with increasing x, while the temperature coefficient of resonant frequency was tuned from -33.9 to -14.7 ppm/°C. The significant improvement of Qf value was achieved in the present ceramics with increasing x and reached the maximum at x = 0.4, but it turned to decrease for x > 0.4. The best combination of microwave dielectric characteristics was achieved at x = 0.4: ϵr = 18.1, Qf = 150 500 GHz, and τf = -26.2 ppm/°C. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00027820
- Volume :
- 93
- Issue :
- 12
- Database :
- Academic Search Index
- Journal :
- Journal of the American Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 55532759
- Full Text :
- https://doi.org/10.1111/j.1551-2916.2010.03990.x