Structure, morphology, and microwave dielectric properties of SmAlO<sub>3</sub> synthesized by stearic acid route

Jiamao LI; Chuimin ZHANG; Hui LIU; Tai QIU; Chuangang FAN

doi:10.1007/s40145-020-0394-5

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Research Article | Open Access

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

Jiamao LI^{^a^,^b}(), Chuimin ZHANG^{^a}, Hui LIU^{^a}, Tai QIU^{^c}, Chuangang FAN^{^a}()

aSchool of Materials Science and Engineering, Anhui University of Technology, Maanshan 243032, China

bKey Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui University of Technology, Maanshan 243002, China

cCollege of Materials Science and Engineering, Nanjing Tech University, Nanjing 211816, China

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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 ε_r = 20.22, quality factor Q·f = 74110 GHz, and a temperature coefficient of resonant frequency τ_f = -74.6 ppm/℃) were achieved.

Keywords

stearic acid precursor process nanoparticle perovskite microwave ceramics

References

[1]

, C

Jiang

, YX

Mei

, et al. Synthesis and microwave dielectric properties of Sm₂SiO₅ ceramics. J Am Ceram Soc 2012, 95: 37-40.

Parameter	SmAlO₃-SS	SmAlO₃-H	SmAlO₃-PP	SmAlO₃-SA
Lattice parameter (Å)	a = 5.2912	a = 5.2888	5.2672	5.2834
	b = 5.2904	b = 5.2784	5.2779	5.2866
	c = 7.4740	c = 7.4733	7.4448	7.4707
Cell volume (Å³)	209.22	208.63	206.96	208.66
Crystallite size (nm)	—	—	45	29 (2θ = 33.9°)

Method	CT (℃)	ST (℃)	RD (%)	Average particle size (nm)^*	ε_r	Q·f (GHz)	τ_f (ppm/℃)	Ref.
SS	1400	1650	—	—	20.4	65000	-74	[5]
PP	900	1550	97.2	26	20.94	78600	-71.8	[19]
CP	900	1550	97	45	20.54	75380	-69.2	[18]
SA	750	1500	96.5	29	20.22	74110	-74.6	This work

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

Abstract

Keywords

References

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