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XRD patterns of the homogenized mixtures of KNN prepared from monoclinic and orthorhombic Nb2O5 precursors, denoted as KNN-mono and KNN-ortho, respectively, annealed at 400–700 °C. o stands for orthorhombic Nb2O5; P for the perovskite phase; m for monoclinic Nb2O5; and • for the poorly crystalline orthorhombic phase. The arrows mark the appearing perovskite phase. (Reprinted with permission from [82]. Copyright 2013 Elsevier).
