Sol-gel processing and characterization of potassium niobate nano-powders by an EDTA/citrate complexing method

Yang Cao, Kongjun Zhu, Jinhao Qiu, Xuming Pang, Hongli Ji

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The present research describes a modified sol-gel technique used to obtain nano-crystalline potassium niobate (KNbO 3) powders by using ethylene diamine tetraacetic acid (EDTA)/citrate as a complexing agent. The metal ions chemically interact with EDTA in the precursor sol. The aging treatments lead to the formation of a precursor-polymeric gel network. The effects of the amounts of citric acid and EDTA on the stability of the precursor sol are investigated. The influence of excess K on the formation of pure-phase KNbO 3 powders is also studied. The obtained gels and powders are characterized by thermogravimetric-differential scanning calorimetry, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The results indicate that a stable precursor sol is formed when n(CA):n(M n+) = 3:1 and n(EDTA):n(NH 4OH) = 1:3.5. The xerogel is calcined at 700-850 °C to prepare the KNbO 3 nano-powder. The smallest grain size of the sample obtained at 850 °C is about 60 nm when the K/Nb molar ratio equals 1.2. Crown

Original languageEnglish
Pages (from-to)655-660
Number of pages6
JournalSolid State Sciences
Volume14
Issue number5
DOIs
Publication statusPublished - 2012 May 1
Externally publishedYes

Keywords

  • EDTA/citrate
  • KNbO
  • Nano-powder
  • Sol-gel

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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