Low-temperature sintering and microwave dielectric properties of B2O3-added ZnO-deficient Zn2GeO4 ceramics for advanced substrate application
| Autor: | Sahn Nahm, Mir Im, Sang Hyo Kweon, Xing Hua Ma |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Secondary phase Materials science Microwave dielectric properties Sintering Liquid phase 02 engineering and technology Substrate (electronics) 021001 nanoscience & nanotechnology 01 natural sciences Chemical engineering visual_art Phase (matter) 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic 0210 nano-technology Stoichiometry |
| Zdroj: | Journal of the European Ceramic Society. 38:4682-4688 |
| ISSN: | 0955-2219 |
| Popis: | ZnO-deficient Zn2-xGeO4-x ceramics with 0.05 ≤ x ≤ 0.15 were synthesized because a ZnO secondary phase is formed in the stoichiometric Zn2GeO4 ceramics synthesized using micrometer-sized ZnO and GeO2 powders. The Zn1.9GeO3.9 ceramic sintered at 1000 °C showed a homogeneous Zn2GeO4 phase with good microwave dielectric properties: er of 6.8, Q × f of 49,000 GHz, and τf of −16.7 ppm/°C. However, its sintering temperature was still too high for it to be used as an advanced substrate for low-temperature co-fired ceramic devices. Therefore, various amounts of B2O3 were added to the Zn1.9GeO3.9 ceramics to reduce their sintering temperature. Owing to the formation of a B2O3-GeO2 liquid phase, these ceramics were well sintered at low temperatures between 925 °C and 950 °C. In particular, 15 mol% B2O3-added Zn1.9GeO3.9 ceramic sintered at 950 °C showed promising microwave dielectric properties for advanced substrates without the reaction with an Ag electrode: er = 6.9, Q × f = 79,000 GHz, and τf = −15 ppm/°C. |
| Databáze: | OpenAIRE |
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