期刊
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
卷 61, 期 1, 页码 112-118出版社
SPRINGER
DOI: 10.1007/s10971-011-2598-1
关键词
SmAlO3; Citrate precusor method; Sintering; Microwave dielectric properties
SmAlO3 nanopowder synthesized by a citrate precursor method using citric acid as a chelating agent and ethylene glycol as an esterifying agent was reported in this paper. The phase purity of the as-prepared powder was examined using thermogravimetry (TG) analysis and differential scanning calorimetry (DSC) analysis, Fourier transform infrared spectroscopy (FTIR). The X-ray diffraction (XRD) studies showed that pure SmAlO3 phase with orthorhombic perovskite structure could be synthesized at 800 degrees C for 2 h without any detectable intermediate phase. The average particle size calculated from transmission electron microscopy (TEM) investigation for the powder synthesized at 900 degrees C was as low as 45 nm. The nanopowder was sintered to a density of 97% of the theoretical density at 1,550 degrees C for 2 h and the bulk ceramics exhibited excellent microwave dielectric properties as follows: a dielectric constant of 20.54, a quality factor of 75,380 GHz and a temperature coefficient of resonate frequency of -69.2 ppm/K.
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