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- Title
Glass-Free K<sub> x</sub>Ba<sub>1− x</sub>Ga<sub>2− x</sub>Ge<sub>2+ x</sub>O<sub>8</sub> Ceramics for Low-Temperature Cofired Ceramics Technology: Synthesis, Phase Transitions, Sintering, and Microwave Dielectric Properties.
- Authors
Qin, Ni; Kržmanc, Marjeta Maček; Suvorov, Danilo
- Abstract
K xBa1− xGa2− xGe2+ xO8 (0.6≤ x≤1) polycrystalline ceramics are potential materials for glass-free low-temperature cofired ceramics (LTCC) substrates. We have made a comprehensive study of the kinetics of the monoclinic-to-monoclinic P21/ a⇔ C2/ m phase transition. The low-temperature-stable P21/ a phase with a high Q× f value was synthesized using a subsolidus method and was well sintered at the LTCC temperature with a H3BO3 additive. A good combination of low sintering temperature (910°–920°C), high Q× f values (96 700–104 500 GHz), low permittivities (5.6–6.0), and a small temperature coefficient of resonant frequency (∼−20 ppm/°C) was obtained for ceramics with x=0.67 and 0.9 and with 0.1 wt% of H3BO3.
- Subjects
CERAMICS; POLYCRYSTALS; GLASS; SINTERING; LOW temperatures; DIELECTRICS; PHASE transitions; SPECTRAL synthesis (Mathematics)
- Publication
Journal of the American Ceramic Society, 2008, Vol 91, Issue 8, p2593
- ISSN
0002-7820
- Publication type
Article
- DOI
10.1111/j.1551-2916.2008.02489.x