PRODUCTION AND CHARACTERIZATION OF SUBMICRON HEMATITE (alpha-Fe2O3) PARTICLES BY ULTRASONIC SPRAY PYROLYSIS METHOD


Kirci B., Ebin B., Gürmen S.

3rd International Congress on Advances in Applied Physics and Materials Science, Antalya, Turkey, 24 - 28 April 2013, vol.1569, pp.265-268 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 1569
  • Doi Number: 10.1063/1.4849273
  • City: Antalya
  • Country: Turkey
  • Page Numbers: pp.265-268

Abstract

The ultrasonic spray pyrolysis (USP) method has been used to prepare submicron hematite (alpha-Fe2O3) particles using two different industrial pickling solutions of iron chloride (41 g/L FeCl2 and 54 g/L FeCl3) Particles were obtained by thermal decomposition of generated aerosols from precursor solutions using 1.7 MHz ultrasonic atomizer. Reaction temperature was set up at 800 degrees C and aerosol droplets were carried into the heated zone by 0.7 L/min air flow rate. X-Ray Diffraction (XRD) studies were used to determine the crystal structure and crystallite size of the particles. Results indicate that patterns correspond to hematite phase with rhombohedral crystal structure (space group: R3c). The crystallite sizes of particles prepared from FeCl2 and FeCl3 solutions that were calculated from Scherrer equation are 59 and 33 nm, respectively. Scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS) investigations give detailed information about particle size, morphology and composition. SEM micrographs show that hematite nanoparticles aggregate and formed spherical secondary particles in submicron range.