A novel Li2TiO3–Li2CeO3 ceramic composite with excellent microwave dielectric properties for low-temperature cofired ceramic applications
| Autor: | Ruzhong Zuo, Weiqiong Liu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
010302 applied physics
Materials science Scanning electron microscope Composite number Sintering 02 engineering and technology Dielectric 021001 nanoscience & nanotechnology 01 natural sciences visual_art 0103 physical sciences Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Chemical stability Ceramic Composite material 0210 nano-technology Temperature coefficient Microwave |
| Zdroj: | Journal of the European Ceramic Society. 38:119-123 |
| ISSN: | 0955-2219 |
| Popis: | A novel low-temperature sinterable (1 − x)Li2TiO3-xLi2CeO3 (x = 0.08 − 0.16 in molar) microwave dielectric ceramic was successfully prepared by a conventional solid-state reaction method. The X-ray diffraction and scanning electron microscopy analysis revealed the coexistence of two phases with different structures owing to their good chemical stability. Their relative content was easily adjusted to achieve near-zero temperature coefficient of the resonant frequency (τf) according to the mixing rule of dielectrics. The low-temperature sintering and desirable microwave dielectric properties can be simultaneously achieved by adding Li2CeO3 to the Li2TiO3 matrix owing to its low-firing characteristic and opposite-sign τf. The composite ceramics with x = 0.14 could be well sintered at 850 °C and exhibited excellent microwave dielectric properties of er ∼ 21.2, Qxf∼ 59,039 GHz and τf ∼−7.4 ppm/°C. In addition, no chemical reaction was identified between the matrix phase and Ag, suggesting that the Li2TiO3-Li2CeO3 ceramics might be promising candidates for low-temperature co-fired ceramic applications. |
| Databáze: | OpenAIRE |
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