Abstract
Data analyses of XRD and XANES using Fe as absorber have been conducted which were aimed for phase identification, Fe oxidation state determination, absorption edge value (E0) calculation, and valence electron determination of LiFexCu1-xPO4 (x = 3%, 4%, and 5%) powders. The powders were prepared by a dissolution method with the source of Fe was local ironstone from South Kalimantan, Indonesia. Analyses of the x-ray diffraction data of the powders were done using the Rietveld method. The XANES data were acquired using Fe K-edge spectral techniques at Synchrotron Light Research Institute (SLRI), Nakhon Ratchasima, Thailand. Results showed that olivine was the only identified phase in the LiFe1-xCuxPO4 powders. Further analyses gave the crystallite size of 188, 193, and 205 nm and cell volume of 278.96, 279.12, and 280.52 Å3, for the x = 3, 4, and 5% samples, respectively. Qualitative analysis of the XANES data acquired for all samples showed the oxidation state of Fe2+, and the absorption edge values (E0) were 7121.56, 7121.71 and 7121.75 eV for the samples.
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