Abstract
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 °C due to recrystallization of CdO. After autoclaving the Cd(OH) 2 suspension at 220 °C, CdO was found in the precipitates as the dominant phase. These precipitates also 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 °C to almost spherical monodisperse CdO particles. The particles obtained by autoclaving the Cd(OH) 2 suspension showed very different size and shapes. These particles were in the form of nanowires, school rulers or bundles of long rods (cable-like). Some of these long rods were broken.
Published Version
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