Local structure examination of mineral-derived Fe2O3 powder by Fe K-edge EXAFS and XANES

5th International Conference on Advanced Materials Sciences and Technology

Husain, H.^1,2 ; Hariyanto, B.^1 ; Sulthonul, M.^1 ; Thamatkeng, P.^3 ; Pratapa, S.^1

Department of Physics, Faculty of Natural Sciences, Institut Teknologi Sepuluh Nopember (ITS), Jl. Arief Rahman Hakim, Surabaya

60111, Indonesia^1

Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Makassar (UNM), Jl. A. Pangeran Pettarani, Makassar

90222, Indonesia^2

Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima, Thailand^3

关键词: and Fe2O3;    EXAFS;    Iron stones;    Local structure;    Oxidation state;    XANES;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/367/1/012027/pdf
DOI  :  10.1088/1757-899X/367/1/012027

来源: IOP

【 摘 要 】

Fe K-edge XANES (X-ray Absorption Near Edge Structure) and EXAFS (Extended X-ray Absorption Fine Structure) spectra have been used to investigate the local structures of hematite (Fe2O3) powders which were synthesized from local iron stone. The formation of hematite with various calcination temperature (500, 650, 800) °C was observed from XRD data of each powder, and Fe K-edge EXAFS and XANES were performed to sample with calcination temperature 800 °C. The XANES spectra confirmed the oxidation state of the powders. The energy position of the first pre-edge peak at (7113.5 ± 0.5) eV confirm Fe3+. The absorption edges of Fe2O3powders was 7123.41 eV. The first EXAFS data analysis showed that Fe2O3powder exhibited nearest-neighbor distances RFe-O= 1.56449 Å and RFe-Fe= 3.01449 Å. The XRD lattice parameter values for the sample is in a fair agreement with the nearest-neighbor distances according to the EXAFS data.