Title : Formation of amorphous selenium using high-energy mechanical alloying
Nanostructured selenium powder with amorphous phase are obtained by mechanical allowing, structural and morphological changes in the crystalline element selenium upon high-energy ball milling has been studied, milling experiments have been performed at the ambient temperature in a high-energy ball mill planetary (Fritsch Pulverisette 7). The amorphous nature of the Se was verified using X-ray diffraction (XRD), and differential scanning calorimetry (DSC) techniques, scanning electron microscopy (SEM) equipped with energy dispersive X-ray analysis (EDS), has been used for morphology and microstructure observations. Partially solid-state amorphization has been realized in elemental selenium by means of mechanical alloying of tetragonal phase crystalline Se powder. XRD indicated that the amorphization process of crystalline Se was after 2h of milling. The activation energy calculated from kissenger’s equation is found to be 225, 045 ±12.06 K J mol-1.
Keywords: Selenium nanostructured, crystallization, Differential scanning calorimetry, X-ray powder diffraction