Microwave dielectric properties of ultra-low temperature fired Li 3 BO 3 ceramics
| Autor: | Chih-Kai Tsai, Shun-Yu Chang, Ching-Fang Tseng, Hsiao-Fen Pai |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Secondary phase Materials science Microwave dielectric properties Mechanical Engineering Metals and Alloys Analytical chemistry Sintering Mineralogy 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Mechanics of Materials visual_art Phase (matter) 0103 physical sciences Materials Chemistry visual_art.visual_art_medium Ceramic 0210 nano-technology Microwave Monoclinic crystal system |
| Zdroj: | Journal of Alloys and Compounds. 698:814-818 |
| ISSN: | 0925-8388 |
| DOI: | 10.1016/j.jallcom.2016.12.268 |
| Popis: | A ultra-low firing Li 3 BO 3 microwave dielectric ceramics with monoclinic structure were prepared by the conventional solid-state reaction method, and the phase assemblages, microstructures and microwave dielectric properties were investigate. Samples were sintered at 580–640 °C for 2–8 h which is extremely lower than 960 °C. The XRD patterns of sintered specimens showed the main phase Li 3 BO 3 coexisted with HBO 2 and Li 6 B 4 O 9 secondary phases were observed. Large number of HBO 2 secondary phase increased when the sintering temperature and time over 600 °C and 6 h, respectively. The variations in the microwave dielectric properties of Li 3 BO 3 ceramics were depended on the secondary phases. Li 3 BO 3 ceramics sintered at 600 °C for 6 h possessed an optimal microwave dielectric properties of ɛ r = 5, Q × f = 37,200 GHz, and τ f = 3.1 ppm/°C. The good microwave dielectric properties and relatively low sintering temperature would make Li 3 BO 3 ceramics promising candidate for LTCC integration applications. |
| Databáze: | OpenAIRE |
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