Uniform crystalline CdSnO(3)(.)3H(2)O nanocubes with a 28-35 nm edge length have been obtained via the ionexchange reaction of Na2Sn(OH)(6) in a CdSO4 aqueous solution, assisted by ultrasonic treatment. Precursor Na2Sn(OH)(6) crystals were prepared via hydrothermal treatment in an ethanol/water solution. The formation of CdSnO3, 3H(2)O nanocubes resulted from the strain during the ion-exchange process. The influences of reaction conditions, such as ion-exchange (ultrasonic treatment) duration, solvent constitutes, surfactant, and pH on the formation of CdSnO3, 3H(2)O crystals were described. Crystalline CdSnO3 and Cd2SnO4 have been obtained by thermal treatment at 300 and 500 degrees C, respectively, for 5 h under an inert-gas protecting condition using CdSnO3, 3H(2)O nanocubes as the precursor. The cube shape of CdSnO3, 3H(2)O was sustained after thermal decomposition to CdSnO3.