title: 3D architectures of iron molybdate: phase selective synthesis, growth mechanism, and magnetic properties.
abstract: Monoclinic and orthorhombic Fe(2)(MoO(4))(3) microsized particles with complex 3D architectures have been selectively prepared by a template-free hydrothermal process. The pH value, reaction time, temperature, and molybdenian source have crucial influence on the phase formation, shape evolution, and microstructures. Monoclinic Fe(2)(MoO(4))(3) particles obtained at pH 1 and pH 1.65 display ferromagnetic ordering at 10.4 K and 10.5 K, respectively, and the ferromagnetic component is determined to be 0.0458 mu(B) and 0.0349 mu(B) per Fe-ion at 10 K, respectively. For orthorhombic beta-Fe(2)(MoO(4))(3), antiferromagnetic ordering was observed about 12 K. At higher temperatures, beta-Fe(2)(MoO(4))(3) began to follow the Curie-Weiss law with theta=-70 K. Such 3D architectures of monoclinic and orthorhombic beta-Fe(2)(MoO(4))(3) microparticles with unique shapes and structural characteristics may find applications as catalysts and as well as in other fields.
authors.affiliation: Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, School of Chemistry and Materials, University of Science and Technology of China, Hefei 230026, P. R. China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Ding
authors.forename: Shu-Hong
authors.initials: SH
authors.lastname: Yu
authors.forename: Chen
authors.initials: C
authors.lastname: Liu
authors.forename: Zheng-An
authors.initials: ZA
authors.lastname: Zang
mesh_terms: D003460:Crystallization; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008982:Molybdenum / Q000737:chemistry*; D010316:Particle Size; D012680:Sensitivity and Specificity; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: C044659:molybdate; D008982:Molybdenum; D007501:Iron