Author/Authors :
Molins، Elies نويسنده , , Roig، Anna نويسنده , , Popovici، Mihaela نويسنده , , Gich، Marti نويسنده , , Niansk، Daniel نويسنده , , Savii، Cecilia نويسنده , , Casas، Lluis نويسنده , , Zaveta، Karel نويسنده , , Enache، Corina نويسنده , , Sort، Jordi نويسنده , , Brion، Sophie de نويسنده , , Chouteau، Gerard نويسنده , , Nogues، Josep نويسنده ,
Abstract :
(epsilon)-Fe2O3 nanoparticles embedded in a SiO2 matrix have been synthesized by sol-gel chemistry and high temperature heat treatments. Virtually pure (epsilon)-Fe2O3 (in excess of 93%) is obtained, although a two-phase mixture, (epsilon)-Fe2O3 + (alpha)-Fe2O3, is observed for Fe2O3/SiO2 ratios greater than 37 wt %. The (epsilon)-Fe2O3 nanoparticles are stable up to ~1600 K. Optimized (epsilon)-Fe2O3 nanoparticles are ferrimagnetic, with a Curie temperature TC (almost equal)510 K, and remarkably high values of room-temperature coercivity, HC = 20 kOe.
Keywords :
image segmentation , Defects , wood , Scanning , image processing
