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Title: Hydrothermal synthesis of potassium–sodium niobate powders
Authors: Pişkin, Cerem
Karacasulu, Levent
Ischia, Gloria
Bortolotti, Mauro
Ahmetoğlu, Çekdar Vakıf
01. Izmir Institute of Technology
01. Izmir Institute of Technology
University of Trento
University of Trento
01. Izmir Institute of Technology
Keywords: Hydrothermal synthesis
Potassium sodium niobate
Powders materials
Issue Date: Jun-2022
Publisher: Wiley
Abstract: Potassium–sodium niobates (KxNa1−xNbO3, 0 < x < 1, KNN) were hydrothermally synthesized under varying alkaline ratios (K+/Na+), total hydroxide concentration, reaction temperature, and time. Compositional surveys were developed by using Rietveld analyses derived quantitative volume fractions. The data demonstrated that phase pure KNN synthesis can be achieved by reacting the niobium source with the hydroxide solution having 6 M total hydroxide concentration, cation ratio (K+/Na+) of above 6 at temperatures ≥200°C for 24 h. Dissolution–precipitation events through intermediate products including hexaniobates were postulated as a plausible formation mechanism. It was shown also that the single-phase KNN approaching the morphotropic phase boundary (MPB) could be obtained by further incorporation of sodium ions into the crystal via post-annealing at 800°C/2 h, following the hydrothermal synthesis.
Appears in Collections:Materials Science and Engineering / Malzeme Bilimi ve Mühendisliği
Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

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