Optimized synthesis of the elusive is a member of the set of -Fe2O3 phase via so

2019-08-14 09:37:42

temperature set member nanoparticles Fe2O3

责任者: Popovici, Mihaela;Gich, Marti;Niznansky, Daniel;Roig, Anna;Savii, Cecilia;Casas, Lluis;Molins, Elies;Zaveta, Karel;Enache, Corina;Sort, Jordi;De Brion 单位: Inst. de Cie. de Mat. de Barcelona, Esfera UAB, 08193 Bellaterra, Catalunya, Spain 来源出处: Chemistry of Materials,2004,16(25):5542-5548 摘要: is a member of the set of -Fe2O3 nanoparticles embedded in a SiO 2 matrix have been synthesized by sol-gel chemistry and high temperature heat treatments. Virtually pure is a member of the set of -Fe2O3 (in excess of 93%) is obtained, although a two-phase mixture, is a member of the set of -Fe 2O3 + α-Fe2O3, is observed for Fe2O3/SiO2 ratios greater than 37 wt %. The is a member of the set of -Fe2O3 nanoparticles are stable up to [similar to] 1600 K. Optimized is a member of the set of -Fe2O3 nanoparticles are ferrimagnetic, with a Curie temperature TC approximately equals 510 K, and remarkably high values of room-temperature coercivity, HC = 20 kOe. 关键词: Nanostructured materials;Synthesis (chemical);Iron compounds;Heat treatment;Sol-gels;Binary mixtures;Thermal effects;Curie temperature;Sol-gel chemistry;Room temperature