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Nanocrystalline perovskite KNbO 3 is prepared by a peroxo-precursor decomposition method at moderate temperatures of 650–900°C. Peroxo-heteropoly-niobic acid is prepared by direct reaction between NbC powder and H 2 O 2 aq, and mixing the peroxo-heteropoly-niobic acid with KOH aq yields an amorphous precursor salt. Perovskite KNbO 3 is obtained by heating the precursor...
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