Local and long-range atomic/magnetic structure of non-stoichiometric spinel iron oxide nanocrystallites.

ABSTRACT: Spinel iron oxide nanoparticles of different mean sizes in the range 10-25 nm have been prepared by surfactant-free up-scalable near- and super-critical hydro-thermal synthesis pathways and characterized using a wide range of advanced structural characterization methods to provide a highly detailed structural description. The atomic structure is examined by combined Rietveld analysis of synchrotron powder X-ray diffraction (PXRD) data and time-of-flight neutron powder-diffraction (NPD) data. The local atomic ordering is further analysed by pair distribution function (PDF) analysis of both X-ray and neutron total-scattering data. It is observed that a non-stoichiometric structural model based on a tetragonal γ-Fe₂O₃ phase with vacancy ordering in the structure (space g

SUBMITTER: Andersen HL 

PROVIDER: S-EPMC7792993 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature