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Ultrasonically assisted hydrothermal synthesis of nanocrystalline ZrO2, TiO2, NiFe2O4and Ni0.5Zn0.5Fe2O4powders

Authors
Journal
Ultrasonics Sonochemistry
1350-4177
Publisher
Elsevier
Publication Date
Volume
13
Issue
1
Identifiers
DOI: 10.1016/j.ultsonch.2004.12.002
Keywords
  • Ultrasonically Assisted Hydrothermal Synthesis
  • Nanomaterials
  • Titania
  • Zirconia
  • Nickel–Zinc Ferrites
Disciplines
  • Earth Science
  • Geography
  • Physics

Abstract

Abstract Ultrasonic-hydrothermal and hydrothermal treatment was used for synthesis of nanocrystalline zirconia, titania, nickel and nickel–zinc ferrites powders from precipitated amorphous zirconyl, titanyl, binary nickel–iron and ternary nickel–zinc–iron hydroxides, respectively. Resulted nanopowders were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption (BET), and magnetic susceptibility measurements. It was established that ultrasonically assisted hydrothermal treatment of amorphous zirconyl and titanyl gels results in significant rise of the rate of ZrO 2 and TiO 2 crystallization and promotes formation of thermodynamically stable monoclinic zirconia, but does not affect the microstructure and mean particles size of resulting nanopowders. Ultrasonic-hydrothermal processing of co-precipitated amorphous nickel, zinc and iron hydroxides favours formation of nanocrystalline ferrite powders with narrower particle size distribution.

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