Synthesis of Fe:MgAl2O4 nanopowders by laser ablation
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The features of production of Fe:MgAl2O4 nanopowders by evaporation of targets made from a simple oxide mixture (Fe2O3, MgO, Al2O3) by repetitively pulsed CO2 laser radiation with I = 1.8 MW/cm2 peak power density and Paver = 600 W average radiation power as well as by ytterbium fiber laser radiation (I = 0.4 MW/cm2 and Paver = 300 W) were studied. It was demonstrated that the nanopowder produced with the use of the CO2 laser has the specific surface of 56 m2/g and contains two crystalline phases, i.e. MgAl2O4 (98.2 wt%) and MgO (1.8 wt%), with Fe ions dissolved in them. At the average radiation power of 600 W, the output of the nanopowder was 16 g/h. For the nanopowder produced using the ytterbium fiber laser, a twofold increase of the specific surface (105 m2/g) was observed. This nanopowder contains four phases, i.e. MgAl2O4 (67.5 wt%), γ-Al2O3 (24.8 wt%), Fe3O4 (3.2 wt%) and MgO (4.5 wt%). In this case, the output of the nanopowder was 2.7 g/h due to high transparency of initial target and the formation of a “forest-like” array of 4–5-mm-high spikes covered with a semitransparent melt layer. Significant differences in the phase compositions of the nanopowders obtained using these lasers are associated with a higher rate of the laser plume cooling for the ytterbium fiber laser.
The authors are grateful to V.V. Lisenkov for useful discussions of the research, to T.M. Demina for measuring the specific surface of the nanopowders, to O.R. Timoshenkova and A.M. Murzakaev for TEM imaging of the nanoparticles, to V.A. Shitov and K.E. Lukyashin for fabrication of the targets, and to M.S. Naumova for help with experiments and analysis of results. The work was carried out within the framework of the State task project No. 0389-2016-0002 with partial financial support of the Russian Foundation for Basic Research under project No. 17-08-00064 A.
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