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Low-temperature synthesis of potassium triniobate (KNb3O8) ceramic powder by a novel aqueous organic gel route

Low-temperature synthesis of potassium triniobate (KNb3O8) ceramic powder by a novel aqueous... Potassium triniobate (KNb3O8) ceramic powder has been synthesized by a novel aqueous organic gel route relatively at low calcination temperature above 700 °C. Initially, homogeneous K-Nb precursor gels were prepared using the starting materials K-EDTA and Nb-citrate complex. Afterward, the mixture in stoichiometric ratio of K, Nb, and citric acid produced a pale yellow viscous like gel from which precursor powder was obtained after prolonged heating at 80 °C. The X-ray diffraction patterns reveal the formation of nearly single crystalline phase of KNb3O8 powder calcinated from 750 to 800 °C. Furthermore, the particle size of KNb3O8 powder is also estimated in the nano range using XRD data by the Debye-Scherrer formula. The microstructure, compositional homogeneity, and EDS analysis were performed by scanning electron microscopy that confirmed the fine, almost homogeneous agglomerate microstructure of synthesized ceramics. Thermal analysis showed about 90.3% weight loss of the precursor powder which was mainly responsible for the decomposition of the organic and some other substances. FTIR analysis ensured characteristic absorption bands for the formation of KNb3O8 ceramic powder. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Australian Ceramic Society Springer Journals

Low-temperature synthesis of potassium triniobate (KNb3O8) ceramic powder by a novel aqueous organic gel route

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Publisher
Springer Journals
Copyright
Copyright © 2018 by Australian Ceramic Society
Subject
Materials Science; Ceramics, Glass, Composites, Natural Materials; Materials Engineering; Inorganic Chemistry
ISSN
2510-1560
eISSN
2510-1579
DOI
10.1007/s41779-018-0287-z
Publisher site
See Article on Publisher Site

Abstract

Potassium triniobate (KNb3O8) ceramic powder has been synthesized by a novel aqueous organic gel route relatively at low calcination temperature above 700 °C. Initially, homogeneous K-Nb precursor gels were prepared using the starting materials K-EDTA and Nb-citrate complex. Afterward, the mixture in stoichiometric ratio of K, Nb, and citric acid produced a pale yellow viscous like gel from which precursor powder was obtained after prolonged heating at 80 °C. The X-ray diffraction patterns reveal the formation of nearly single crystalline phase of KNb3O8 powder calcinated from 750 to 800 °C. Furthermore, the particle size of KNb3O8 powder is also estimated in the nano range using XRD data by the Debye-Scherrer formula. The microstructure, compositional homogeneity, and EDS analysis were performed by scanning electron microscopy that confirmed the fine, almost homogeneous agglomerate microstructure of synthesized ceramics. Thermal analysis showed about 90.3% weight loss of the precursor powder which was mainly responsible for the decomposition of the organic and some other substances. FTIR analysis ensured characteristic absorption bands for the formation of KNb3O8 ceramic powder.

Journal

Journal of the Australian Ceramic SocietySpringer Journals

Published: Nov 19, 2018

References