Synthesis of nano particle of inorganic oxides by polymer matrix |
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Authors: | P Pramanik |
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Affiliation: | (1) Department of Chemistry, Indian Institute of Technology, 721 302 Kharagpur, India |
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Abstract: | Ultrafine (⩽ 150 nm) powders of spinels MFe2O4 where M = Ni(II), Co(II) and Zn(II)]; rare-earth orthoferrites RFeO3 where R = Sm, Nd and Gd], and rare-earth garnets R3Fe3O12 where R = Sm, Nd and Gd] with good purity and chemical homogeneity were prepared through two new versatile chemical routes.
The first route involved the coprecipitation of the desired metal nitrates from their aqueous solution, in presence of a water
soluble polymer-polyvinyl alcohol (PVA), by triethyl ammonium carbonate solution. The other process involved complete evaporation
of a mixture of optimum amounts of PVA and the desired aqueous metal nitrate solutions, with and without the addition of optimum
amounts of urea when the mixture was evaporated to a pasty mass. In addition, detailed study on the reported potassium ferricyanide
route was also carried out for the production of the rare-earth orthoferrite powders. The various precursor as well as the
heat-treated mixed-oxide powders, prepared through each of the routes, were compared by the physical characterization studies
involving thermal gravimetry and differential scanning calorimetry, infrared spectroscopy, X-ray powder diffraction, transmission
electron microscopy, and room temperature magnetic measurements. |
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Keywords: | Spinel rare-earth orthoferrites rare-earth garnets ultrafine powders chemical route PVA triethylammonium carbonate potassium ferricyanide |
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