title: Tunable morphology and magnetic properties of Bi2Fe4O9 nanocrystal synthesized by hydrothermal method.
abstract: Bi2Fe4O9 nano and micron powders have been synthesized by a hydrothermal method. The as-obtained samples are pure phase and crystallize in the orthorhombic structure. Diverse particle morphologies, including nanoplates, nanospheres, microcubes, and microcylinders, are obtained under different synthesis conditions. The solvent N,N-Dimethylformamide (DMF), together with the mineralisers NaOH and NH4OH, are found to be the key factors for the formation of the particles with their diverse morphologies and sizes. The magnetization dependence of temperature (M-T), observed in a field of 1000 Oe from 10 to 340 K, and M-H loops measured at 10 K indicate that the Bi2Fe4O9 particles are paramagnetic at room temperature and undergo an antiferromagnetic transition at a Néel temperature (T(N)) of 250 K.
authors: Institute for Superconducting and Electronic Materials (ISEM), Innovation Campus - AIIM Facility, University of Wollongong, Squires Way, Fairy Meadow, NSW 2519, Australia.
authors: Yi
authors: Y
authors: Du
authors: Zhenxiang
authors: Z
authors: Cheng
authors: Shixue
authors: S
authors: Dou
authors: Xiaolin
authors: X
authors: Wang
mesh_terms: D001729:Bismuth / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D005290:Ferric Compounds / Q000737:chemistry*; D006358:Hot Temperature; D008280:Magnetics; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D014867:Water / Q000737:chemistry*
chemical_list: D005290:Ferric Compounds; D014867:Water; C000499:ferric oxide; D001729:Bismuth