A Calcination Technology for Ultrafine La₃NbO₇ Powder Prepared by Sol-Gel Process

Abstract:

In order to prepare ultrafine La₃NbO₇ powder, a potential material for thermal barrier coatings, the calcination process of La₃NbO₇ was studied in this paper.The precursor of La₃NbO₇ was synthesized by using a citric acid complex method. A calcination process had been systematically investigated. The reaction temperature was determined by differential scanning calorimetry (DSC). The phase composition of powders was characterized by X-ray diffraction (XRD), and the morphology was obtained by scanning electron microscope (SEM). The results revealed that the single-phase La₃NbO₇ powder could be successfully prepared while the calcination temperature exceeded 800°C and a better morphology could be maintained at 800°C for 4 hours. Considering all above, an optimum calcination scheme was adopted at 800°C for 4 hours. The as-prepared La₃NbO₇ powders had a grain size of about 50nm and an average particle size of about 300nm.

• Periodical: Advanced Materials Research (Volume 412)
• Pages: 271-274
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.412.271
• Online since: November 2011
• Authors: Ying Li, Qiang Xu, Ling Dai
• Keywords: Calcination Process, La₃NbO₇, Sol-Gel Process, Ultra-Fine Powder

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