3D Architectures of Iron Molybdate: Phase Selective Synthesis, Growth Mechanism, and Magnetic Properties

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Abstract
Monoclinic and orthorhombic Fe2(MoO4)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 Fe2(MoO4)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 μB and 0.0349 μB per Fe‐ion at 10 K, respectively. For orthorhombic β‐Fe2(MoO4)3, antiferromagnetic ordering was observed about 12 K. At higher temperatures, β‐Fe2(MoO4)3 began to follow the Curie–Weiss law with θ=−70 K. Such 3D architectures of monoclinic and orthorhombic β‐Fe2(MoO4)3 microparticles with unique shapes and structural characteristics may find applications as catalysts and as well as in other fields.

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