engleski

Formation and properties of Cd(OH)2 and CdO particles

The formation and properties of Cd(OH)2 and CdO particles were monitored by X-ray powder diffraction (XRD), DTA, FT-IR spectroscopy and Field Emission SEM. Trigonal Cd(OH)2 was precipitated as a single phase at room temperature (RT)by adding aqueous solution of tetramethylammonium hydroxide (TMAH) into ethanolic solution of cadmium acetate. The DTA curve of Cd(OH)2 , recorded in air, showed a strong endothermic peak centered at 245 oC due to recrystallization of CdO. After autoclaving the Cd(OH)2 suspension at 220 oC, CdO was found in the precipitates as a dominant phase. These precipitates contained Cd(OH)2 with trigonal symmetry, Cd(OH)2 having monoclinic symmetry (possible identification) and one unidentified phase. platelike particles of Cd(OH)2 changed at 300 oC to almost spherical monodisperse CdO particles. The particles obtained by autoclaving the Cd(OH)2 suspension showed very different size and shapes. The particles were in the form of nanowires, school rulers or bundles of long rods (cable-like). Some of these long rods were broken.

Cd(OH)2; CdO; XRD; DTA; FT-IR; FE SEM

nije evidentirano