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Uniform hollow hematite (α-Fe 2 O 3 ) spheres with diameter of about 600–700nm and shell thickness lower than 100nm are obtained by direct hydrothermal treatment of dilute FeCl 3 and tungstophosphoric acid H 3 PW 12 O 40 solution at 180°C. The hollow spheres are composed of robust shells with small nanoparticles standing out of the surface and present...
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