title: Ultrasonically assisted hydrothermal synthesis of nanocrystalline ZrO2, TiO2, NiFe2O4 and Ni0.5Zn0.5Fe2O4 powders.
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 ZrO2 and TiO2 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.
authors.affiliation: Inorganic Chemistry Division, Department of Chemistry, Moscow State University, Moscow 119992, Russian Federation.
authors.forename: Pavel E
authors.initials: PE
authors.lastname: Meskin
authors.forename: Vladimir K
authors.initials: VK
authors.lastname: Ivanov
authors.forename: Alexander E
authors.initials: AE
authors.lastname: Barantchikov
authors.forename: Bulat R
authors.initials: BR
authors.lastname: Churagulov
authors.forename: Yury D
authors.initials: YD
authors.lastname: Tretyakov
mesh_terms: D003460:Crystallization / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry* / Q000528:radiation effects; D006358:Hot Temperature; D049329:Nanostructures / Q000737:chemistry* / Q000528:radiation effects / Q000648:ultrastructure; D010316:Particle Size; D011208:Powders; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects; D014867:Water / Q000737:chemistry*; D015040:Zirconium / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D005290:Ferric Compounds; D011208:Powders; D014867:Water; C001215:ferrite; C009495:titanium dioxide; D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide