BaTi3O7 center dot nH(2)O nanotubes have been synthesized through a hydrothermal reaction between Na-rich trititanate nanotubes and Ba(OH)(2) within the pH range 12-8.2. These nanotubes possess the same layered crystal structure of the precursor Na2-xHx-Ti3O7 center dot nH(2)O. They also keep the morphology of their precursor Na-trititanate nanotubcs used in the synthesis, having an external diameter of 20-25 nm. The BaTi3O7 center dot nH(2)O nanotubes remained fully stable up to 300 degrees C, while nanotubular form continues to exist up to 600 degrees C, together with amorphous particles. (C) 2007 Elsevier Ltd. All rights reserved.