Effect of cooling rate on microstructure and microwave dielectric properties of MgO doped (Sr,Ca)TiO3-(Sm,Nd)AlO3 ceramics
| Autor: | Qinxian Jiang, Qinglin Cao, Qinglin Chen, Hongqing Zhou, Wentao Xie |
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| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
Materials science Morphology (linguistics) Microwave dielectric properties Doping Analytical chemistry Mineralogy Sintering 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Cooling rate visual_art 0103 physical sciences visual_art.visual_art_medium Ceramic Electrical and Electronic Engineering 0210 nano-technology Perovskite (structure) |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 28:6407-6412 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-016-6325-0 |
| Popis: | The effect of MgO additive on phase composition, microstructure, sintering behavior, and microwave dielectric properties of 0.7(Sr0.01Ca0.99)TiO3-0.3(Sm0.75Nd0.25)AlO3 (7SCT-3SNA) ceramics prepared via conventional solid-state route were systematically investigated. MgO as additive showed no obvious influence on the phase composition of 7SCT-3SNA ceramics and all the samples exhibited pure perovskite structures. The presence of MgO additive effectively reduced the sintering temperature of 7SCT-3SNA ceramics from 1500 to 1380 °C. Besides, it is found that 0.5 wt% MgO could improve the uniformity of the grain morphology significantly, thus Q × f value enhanced consequently. Results also showed that enhanced Q × f value could be obtained as cooling rate slowed down. Superior microwave dielectric properties with an e r of 44.96, a Q × f value of 45738 GHz (at 5.5 GHz), and τ f value of −2.46 ppm/°C are obtained for 0.5 wt% MgO doped 7SCT-3SNA ceramics sintered at 1380 °C with a cooling rate of 60 °C/h. |
| Databáze: | OpenAIRE |
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