Tungsten bronze type structure, atmosphere sensitivity and microwave dielectric properties of Ba4(CexSm1−x)9.3Ti18O54 ceramics
| Autor: | Mao-Lin Mu, Hongjuan Su, Burhan Ullah, Kerong An, Fangyuan Chen, Wen-Zhong Lu, Xiao-Hong Wang, Jing Tao |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element Mineralogy 02 engineering and technology engineering.material Tungsten 01 natural sciences Ion 0103 physical sciences Ceramic Electrical and Electronic Engineering Bronze 010302 applied physics Valence (chemistry) 021001 nanoscience & nanotechnology Condensed Matter Physics Nitrogen Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Cerium chemistry visual_art visual_art.visual_art_medium engineering 0210 nano-technology Solid solution |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 28:16888-16894 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-017-7607-x |
| Popis: | The phase structure, ions valence state and microwave dielectric properties of Ba4(Ce x Sm1−x )9.3Ti18O54 (0 ≤ x ≤ 0.9, BCST) ceramics sintered in air and nitrogen have been investigated. BCST (x ≤ 0.1) ceramics sintered in air only exhibited peaks associated with tungsten bronze phase structure. A secondary CeO2 phase appeared for x = 0.5, while CeO2 and Ba2Ti9O20 phases coexisted for the ceramics with x = 0.9. In contrast, ceramics fired in nitrogen exhibited tungsten bronze phase structure for all compositions from x = 0 to 0.9 within the solid solution. The chemical structure analysis exhibited that, all the sample possessed mixed ion valance states of Ce4+/Ce3+ and Ti4+/Ti3+ cations upon oxygen vacancy formations. It is found that incorporation of cerium could significant improve the Q × f values of BCST ceramics sintered in nitrogen with good microwave dielectric properties (Q × f ∼7536 GHz, e r ∼78, and τ f ∼24.61 ppm/°C) at x = 0.5. |
| Databáze: | OpenAIRE |
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