Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 57, Issue 1, Pages 31-35Publisher
SPRINGER
DOI: 10.1007/s10971-010-2320-8
Keywords
(K(0.5)Na(0.5))NbO(3); Oxalic acid; Sol-gel
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Funding
- Scientific Project of Heilongjiang Province [E2007-31]
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Potassium sodium niobate (KNN) ceramic powders by a variation of sol-gel method is synthesized. The metal precursors used for the KNN synthesis are potassium carbonate, sodium carbonate and niobium hydroxide, ethylene glycol are used as chelating and esterification agent, respectively. The effects of amount of oxalic acid (OA) and ethylene glycol (EG), pH value on the stability of the precursor sol were investigated. The evolution of (K(0.5)Na(0.5))NbO(3) crystal phase was also investigated by XRD, IR, SEM and TG-DTA. The results showed that stable precursor sol was formed when n((OA)):n((Mn+)) = 3:1, n((OA)):n((EG)) = 1:2 and pH value was in the range of 2.5-3.5. Xerogel was sintered in the range of 500-650 A degrees C to prepare K(6)Nb(10.88)O(30) and Na(2)Nb(4)O(11) powder. Then the compound was sintered at 750 A degrees C to produce perovskite (K(0.5)Na(0.5))NbO(3) ceramic powders. The grain size is about 100-200 nm.
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