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Highly pure sodium niobate nanotubes (NaNbNTs) were prepared by treating nonporous Nb2O5 powder with 1.0 M NaOH solution at 423 K. SEM revealed that these NaNbNTs formed nanotube-bundles with diameters of 50–250 nm and lengths of several microns. A TEM image of nanotubes indicated that they had outer diameters of 15–20 nm and inner pore diameters of 3–4 nm. BET surface area and pore volume of NaNbNTs...
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