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A simple preparation of KNbO3 powders was proposed by an alternative approach of solid-state reaction. Stoichiometric niobium oxalate and potassium acetate were mixed in water and then dried. It was demonstrated that an ion-exchange reaction occurred with the formation of K[NbO(C2O4)2]·nH2O intermediate. The single-phase KNbO3 powders were synthesized when K[NbO(C2O4)2]·nH2O intermediate was calcined...
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