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Crystal structure and microwave dielectric properties of Mg2+-Si4+ co-modified yttrium aluminum garnet ceramics
Journal of Materials Science: Materials in Electronics ( IF 2.8 ) Pub Date : 2022-02-07 , DOI: 10.1007/s10854-021-07661-0
Guofa Wu 1 , Mingtao Ma 1 , Kaixin Song 1 , Hadi Barzegar Bafrooei 1, 2 , Aihua Li 3 , Shaojin Luo 3 , Amir Khesro 4 , Ehsan Taheri-nassaj 5 , Feng Shi 6 , Shikuan Sun 7 , Dawei Wang 8
Affiliation  

In this article, garnet-type Y3Al5O12 (YAG) were doped with Mg2+-Si4+ ionic pairs and its effect on the structure and the microwave dielectric properties was investigated. It was revealed that in ceramics Y3MgxAl5-2xSixO12 (x = 0, 0.5, 1.0, 1.5, 2.0), increasing doping concentration decreased the sintering temperature and time for the optimal densification. X-ray diffraction studies showed that the samples are isostructural to Al5Y3O12 garnet. All sample were formed a single phase except for x = 2.0, where a secondary peak was detected. Excellent microwave dielectric properties of εr = 10.56, Q × f = 67,571 GHz and τf = -35.23 ppm/°C were obtained for Y3Mg0.5Al4Si0.5O12 ceramics sintered at 1625 °C for 5 h. The factors influencing the microwave dielectric properties of Y3MgxAl5-2xSixO12 ceramics were further discussed by considering the ionic polarization, packing fraction, average grain size and chemical bond valence theory.



中文翻译:

Mg2+-Si4+共改性钇铝石榴石陶瓷的晶体结构和微波介电性能

本文采用Mg 2+ -Si 4+离子对掺杂石榴石型Y 3 Al 5 O 12 (YAG),研究了其对结构和微波介电性能的影响。结果表明,在陶瓷 Y 3 Mg x Al 5-2 x Si x O 12 ( x  = 0, 0.5, 1.0, 1.5, 2.0)中,增加掺杂浓度会降低烧结温度和最佳致密化时间。X 射线衍射研究表明样品与 Al 5 Y 3 O 12同构石榴石。除x = 2.0外,所有样品均形成单相 ,其中检测到第二个峰。Y 3 Mg 0.5 Al 4 Si 0.5 O 12陶瓷在 1625 °C 下烧结 5 小时后,获得了ε r  = 10.56、Q  ×  f  = 67,571 GHz 和τ f  = -35.23 ppm/°C 的优异微波介电性能。Y 3 Mg x Al 5-2 x Si x O 12微波介电性能的影响因素通过考虑离子极化、填充率、平均晶粒尺寸和化学键价理论进一步讨论了陶瓷。

更新日期:2022-02-09
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