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Ultrafine tetragonal BaTiO3 nanocrystals have been prepared by a sol–gel based method. By adjusting the volume ratio of H2O/DEG (diethylene glycol) in the solutions, hydrolysis rate of tetra-n-butyl titanate was strongly inhibited and the particle size could be controlled as small as 4–8 nm. The powder X-ray diffraction and transmission electron microscopy characterizations exhibit that the nanocrystals...
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