材料科学
微观结构
微晶
热重分析
扫描电子显微镜
电介质
陶瓷
烧结
透射电子显微镜
硬脂酸
差热分析
微波食品加热
温度系数
分析化学(期刊)
化学工程
复合材料
衍射
纳米技术
光学
冶金
有机化学
化学
光电子学
物理
工程类
量子力学
作者
Jiamao Li,Chuimin Zhang,Hui Liu,Tai Qiu,Chuangang Fan
标识
DOI:10.1007/s40145-020-0394-5
摘要
Abstract A rapid and facile approach was developed for the synthesis of ultrafine SmAlO 3 powders through the combustion of stearic acid precursors. The obtained products were characterized by typical techniques including X-ray diffraction (XRD), Fourier Transform Infrared (FT-IR), thermogravimetric and differential thermal analysis (TG-DTA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) to analyze the phase composition and microstructure. The dielectric characteristics of SmAlO 3 microwave ceramics, using the as-obtained products as original materials, were also studied. Compared with the conventional solid-state reaction method, the synthesis temperature was dramatically reduced to 750 °C. The large-size sheet structure was composed of a number of micro/nano-scale crystallites, which were mostly irregular in shape due to the mutual growth and overlapping shapes of adjacent grains. The SmAlO 3 ceramics with high density and uniform microstructure were obtained after sintering at 1500 °C for 4 h due to the favorable sintering activity of the as-synthesized powders. In addition, desired dielectric properties at microwave frequencies (dielectric constant ε r = 20.22, quality factor Q · f = 74110 GHz, and a temperature coefficient of resonant frequency τ f = −74.6 ppm/°C) were achieved.
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