Synthesis and characterization of pure nanocrystalline nickel aluminate spinel powder |
Paper ID : 1550-UFGNSM-FULL (R1 |
Authors: |
Abstract: |
Synthesis of nanocrystalline nickel aluminate spinel (NiAl2O4) by mechanical activation of a powder mixture containing Al and NiCO3 with subsequent annealing was investigated. Simultaneous thermal analysis (STA), X-ray diffraction (XRD), and scanning electron microscopy (SEM) techniques were utilized to characterize the as-milled and annealed samples. Results showed that pure nanocrystalline spinel could be fabricated completely by 5 h of mechanical activation with subsequent annealing at 1200 ◦C for 1 h with a crystallite size of about 22 nm. Further milling had no significant effects on structure or phase composition of spinel phase after subsequent annealing. The nanocrystalline spinel powder obtained after 20 h of milling and subsequent annealing at 1200 ◦C for 1 h had a crystallite size of about 27nm according to Williamson–Hall approach. |
Keywords: |
nickel aluminate; nanostructure; mechanical activation; spinel; heat treatment. |
Status : Paper Accepted (Poster Presentation) |