Journal
JOURNAL OF SOLID STATE CHEMISTRY
Volume 180, Issue 2, Pages 489-495Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2006.11.005
Keywords
hematite; hollow spheres; one-pot synthesis; nitrogen adsorption-desorption
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Uniform hollow hematite (alpha-Fe2O3) spheres with diameter of about 600-700 nm and shell thickness lower than 100 nm are obtained by direct hydrothermal treatment of dilute FeCl3 and tungstophosphoric acid H3PW12O40 solution at 180 degrees C. The hollow spheres are composed of robust shells with small nanoparticles standing out of the surface and present a high-surface area and a weak ferromagnetic behavior at room temperature. The effect of concentration of H3PW12O40, reaction time and temperature for the formation of the hollow spheres are investigated in series of experiments. The formation of the hollow spheres may be ascribed to a polyoxometalte-assisted forced hydrolysis and dissolution process. (c) 2006 Elsevier Inc. All rights reserved.
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