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Microwave dielectric properties of Re3Ga5O12 (Re: Nd, Sm, Eu, Dy and Yb) ceramics and effect of TiO2 on the microwave dielectric properties of Sm3Ga5O12 ceramics
- Source :
-
Journal of the European Ceramic Society . Jul2007, Vol. 27 Issue 8/9, p2865-2870. 6p. - Publication Year :
- 2007
-
Abstract
- Abstract: Re3Ga5O12 (Re: Nd, Sm, Eu, Dy and Yb) garnet ceramics sintered at 1350–1500°C had a high quality factor (Q × f) ranging from 40,000 to 192,173GHz and a low dielectric constant (ɛ r) of between 11.5 and 12.5. They also exhibited a relatively stable temperature coefficient of resonant frequency (τ f ) in the range of −33.7 to −12.4ppm/°C. In order to tailor the τ f value, TiO2 was added to the Sm3Ga5O12 ceramics, which exhibited good microwave dielectric properties. The relative density and grain size increased with addition of TiO2, resulting in the enhancement of Q × f value. The τ f increased with the addition of TiO2. Excellent microwave dielectric properties of ɛ r =12.4, Q × f =240,000GHz and τ f =−16.1ppm/°C were obtained from the Sm3Ga5O12 ceramics sintered at 1450°C for 6h with 1.0mol% TiO2. Therefore, Re3Ga5O12 ceramics, especially TiO2-added Sm3Ga5O12 ceramics are good candidates for advanced substrate materials in microwave integrated circuits (MICs) applications. [Copyright &y& Elsevier]
- Subjects :
- *CERAMICS
*GARNET
*SINTERING
*DIELECTRICS
*RESONANCE
Subjects
Details
- Language :
- English
- ISSN :
- 09552219
- Volume :
- 27
- Issue :
- 8/9
- Database :
- Academic Search Index
- Journal :
- Journal of the European Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 24556939
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2006.11.066