XRD patterns of the KNN nanotube arrays and KNN powders derived from the same sol calcined at 700 °C.
SEM images of the KNN nanotubes after dissolving AAO template incompletely. (a) top view in low and high magnification (inset, the bar is 1 μm); (b) cross-section view; (c) EDX spectrum of the KNN nanotubes, inset: the atomic ratio of products.
(a)–(c) TEM images and SAED pattern [inset of Fig. 3(a)] of KNN nanotubes after completely dissolving AAO template; (d) HRTEM image of the KNN nanotube.
(Color online) (a) P-E hysteresis loops of KNN nanotube arrays embedded in AAO template measured with different voltage; the inset is the schematic drawing of the measurement configuration; (b) P-E hysteresis loops of AAO template without KNN nanotubes and with nanotubes.
(Color online) (a) Hysteresis phase loop and (b) amplitude loop of an individual KNN nanotube under axial bias voltage; the insets of Fig. 5(a) are the SEM image of top-view of nanotubes array (left, the bar is 500 nm) and the schematic drawing of the measurement configuration for PFM (right).
Lattice parameters for KNN nanotubes and powders.
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