Structure, morphology, and microwave dielectric properties of SmAlO3 synthesized by stearic acid route

Journal of Advanced Ceramics

Tai Qiu¹  Chuangang Fan²  Hui Liu²  Chuimin Zhang²  Jiamao Li³ 

[1] College of Materials Science and Engineering, Nanjing Tech University, 211816, Nanjing, China;School of Materials Science and Engineering, Anhui University of Technology, 243032, Maanshan, China;School of Materials Science and Engineering, Anhui University of Technology, 243032, Maanshan, China;Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, 243002, Maanshan, China;

关键词: stearic acid precursor process;    nanoparticle;    perovskite;    microwave ceramics;   

DOI  :  10.1007/s40145-020-0394-5

来源: Springer

【 摘 要 】

A rapid and facile approach was developed for the synthesis of ultrafine SmAlO3 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 SmAlO3 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 SmAlO3 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 εr = 20.22, quality factor Q·f = 74110 GHz, and a temperature coefficient of resonant frequency τf = −74.6 ppm/°C) were achieved.

【 授权许可】

CC BY