Synthesis of potassium sodium niobate powders using an EDTA/citrate complexing sol-gel method

Yang Cao, Kongjun Zhu, Hongjuan Zheng, Jinhao Qiu, Honghui Gu

研究成果: Article査読

22 被引用数 (Scopus)

抄録

Potassium sodium niobate (KNN) powders were synthesized by a modified sol-gel method, using as starting chemicals potassium carbonate, sodium carbonate, and niobium hydroxide, and, as esterification and chelating agents, respectively, ethylene glycol (EG) and ethylene diamine tetraacetic acid (EDTA)/citrate. The effects of citric acid (CA), EG, and EDTA on the stability of the precursor sol were systemically investigated. The powders and gels were characterized by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis-differential scanning calorimetry (TGA-DSC). The results indicated that a stable precursor sol was formed when n(CA):n(Mn+) = 3:1, n(EDTA):n(NH4OH) = 1:3.5, and n(CA):n(EG) = 1:2. The xerogel was calcined at 500-950 °C to prepare the KNN powder. Pure KNN perovskite phase with a cube-like structure was synthesized at 850 °C from the precursor sol for a K/Na molar ratio of 1.2. The formation mechanism of the KNN perovskite phase was also discussed.

本文言語English
ページ(範囲)777-782
ページ数6
ジャーナルParticuology
10
6
DOI
出版ステータスPublished - 2012 12 1
外部発表はい

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

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