Author(s)

Matthew Knauss¹, Felicia Tolea², Mihaela Valeanu², Lucian Diamandescu², Richard Trotta¹, Kelly Wood¹, Agnieszka Grabias³, Monica Sorescu¹

¹Department of Physics, Duquesne University, Pittsburgh, USA.
²Department of Materials Science, National Institute of Materials Physics, Bucharest-Magurele, Romania.
³Department of Materials Science, Institute of Electronic Materials Technology, Warsaw, Poland.

xMoO₂-(1-x)α-Fe₂O₃ nanoparticle system with molarities x = 0.1, 0.3, 0.5 and 0.7 was successfully synthesized by mechanochemical activation of MoO₂ and α-Fe₂O₃ mixtures for 0 - 12 hours of ball milling time. X-ray powder diffraction (XRD), Mössbauer spectroscopy and magnetic measurements were used to study the phase evolution of the molybdenum dioxide-hematite nanoparticle system under the mechanochemical activation process. Rietveld refinement of the XRD patterns yielded the values of the crystallite size and lattice parameters as function of milling times and indicated the presence of Mo-substituted hematite and Fe-doped molybdenum dioxide at long milling times. The Mössbauer studies yielded the magnetic hyperfine fields and the relative abundance of a quadrupole-split doublet as function of the milling time for all molar concentrations involved. Recoilless fraction was determined using our dual absorber method and was found to decrease with increasing ball milling time. Magnetic measurements recorded at 5 and 300 K in an applied magnetic field of 50,000 Oe showed the magnetic properties in the antiferromagnetic and canted ferromagnetic states. The Morin transformation was evidenced by zero-field cooling-field cooling (ZFC-FC) measurements in a magnetic field of 200 Oe.

Milling, Spectroscopy, Magnetic Properties

Knauss, M. , Tolea, F. , Valeanu, M. , Diamandescu, L. , Trotta, R. , Wood, K. , Grabias, A. and Sorescu, M. (2018) Mechanochemical Synthesis and Characterization of Molybdenum Dioxide-Hematite Nanostructures with Different Molarities. Journal of Minerals and Materials Characterization and Engineering, 6, 587-600. doi: 10.4236/jmmce.2018.66042.