Influence of impurities in the kinetics of CuO nanostructures grain growth from high energy ball milling

ANA. E. BIANCHI; S. J. STEWART; G. PUNTE; T.S. PLIVELIC; I.L. TORRIANI

PHYSICA B - CONDENSED MATTER

NORTH-HOLLAND

Lugar: The Netherlands; Año: 2006

0921-4526

Influence of impurities in the kinetics of CuO nanostructures grain growth from high energy ball milling   A. E. Bianchia,b, S. J. Stewartb, G. Puntea,b, R. Viñaa, T. S. Plivelicc, I. L. Torrianic,d aLANADI e bIFLP, Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata,  CC67,  1900 La Plata, Argentina. cLaboratório Nacional de Luz Síncrotron (LNLS). dInstituto de Física (IFGW)-UNICAMP-Campinas-SP-Brazil.     Elsevier use only: Received date here; revised date here; accepted date here Abstract X-ray Diffraction (DRX), small angle x-ray dispersion (SAXS), Scanning electron microscopy (SEM) and Energy Dispersive X-ray Analysis (EDAXS) were used to investigate the effect of controlled high energy ball milling (HEBM) on the average volume weighted crystallite size, <D>V and weighted average microstrain,<ε>, of nanostructures of CuO prepared by solid state reaction. The starting material, S0, consists of nanocrystals of monoclinic CuO with <D>V » 20nm and almost strain free, as determined by XRD data Rietveld analysis. It is found that after an initial decrease of <D>V and enhance of <ε> values they go through a steady-state stage and after only 120 m of HEBM <D>V increases an order of magnitude. The influence of the presence of a small amount of contaminants in the starting material on the kinetics of the crystal growth, which follows a sigmoid Gaussian law, is analyzed.   Keywords: High energetic ball milling, CuO, nanoparticles