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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 ℃. 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 ℃ 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/℃) were achieved.


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

Show Author's information Jiamao LIa,b( )Chuimin ZHANGaHui LIUaTai QIUcChuangang FANa( )
School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243032, China
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, China
College of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China

Abstract

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 ℃. 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 ℃ 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/℃) were achieved.

Keywords:

stearic acid precursor process, nanoparticle, perovskite, microwave ceramics
Received: 01 April 2020 Revised: 30 May 2020 Accepted: 02 June 2020 Published: 22 June 2020 Issue date: October 2020
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Publication history
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Publication history

Received: 01 April 2020
Revised: 30 May 2020
Accepted: 02 June 2020
Published: 22 June 2020
Issue date: October 2020

Copyright

© The author(s) 2020

Acknowledgements

The work was financially supported by the Natural Science Foundation of Anhui Provincial Education Department (Nos. KJ2019A0054 and KJ2018A0041), and the National Natural Science Foundation of China (No. 51802003).

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