Molten salt synthesis of complex perovskite-related dielectric oxides

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Date
2001
Authors
Thirumal, M
Jain, P
Ganguli, A K
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Abstract
Perovskite related dielectric oxides of the formula Ba(Zn1=3Nb2=3)O3, Ba(Mg1=3Nb2=3)O3 and Ba(Zn1=3Ta2=3)O3 have been synthesized by the NaCl–KCl molten salt (flux) method at low temperatures of 900-C for 3 or 6 h. Sintering at 1000-C retained the cubic structure.Sintering at 1300-C generated minor amount (-10%) of Ba5Nb4O15 in addition to the main cubic phase for the niobium compounds.The tantalum compounds, on the other hand, decomposed to Ba0:5TaO3, retaining a minor amount of the original cubic phase. Scanning electron micrographs show large grain size (upto 10mm) in some of the samples obtained by the molten salt method.
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Molten salt, Niobates, Tantalates, X-ray diffraction, (XRD), Scanning electron microscopy (SEM)
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