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Title: Synthesis of potassium–sodium niobate (KNN) from NbO2
Authors: Pişkin, Cerem
Karacasulu, Levent
Bortolotti, M.
Ahmetoğlu, Çekdar Vakıf
Keywords: Hydrothermal synthesis
Niobium dioxide
Potassium sodium niobate
Issue Date: 2021
Publisher: Elsevier
Abstract: KxNa1-xNbO3 (0 < x < 1) were synthesized via hydrothermal method using niobium dioxide (NbO2) as the niobium source instead of the most common one, Nb2O5. Potassium-rich KxNa1-xNbO3 (x > 0.5) was obtained from 8 M total hydroxide concentration after 6 h of reaction at 200 °C. Rietveld refinement of the XRD data revealed that all samples exhibited the secondary NaNbO3 phase. However, the lowest amount (3.74 vol%) was obtained for 24 h of reaction under 10 M alkaline solution. After 3 h of reaction, dodecahedra shaped hexaniobate phase (KxNa8-xNb6O19.nH2O) was observed. Those structures were, subsequently, replaced by ~3 ?m cube shaped KNN crystals, obtained under 10 M reaction in 24 h time period. © 2021
ISSN: 2666-5395
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

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