Abstract
Mn-doped sodium iron fluorophosphates Na2Fe0.9Mn0.1PO4F were synthesized using ball milling via a solid-state reaction route. The crystal structure and magnetic properties of the as-prepared materials were studied by using X-ray diffraction (XRD), superconducting quantum interference device (SQUID), and Mossbauer spectroscopy. Structural refinement of Na2Fe0.9Mn0.1PO4F was analyzed using the Fullprof program. From the XRD patterns, the crystal structure was found to be orthorhombic with the space group Pbcn . Na2Fe0.9Mn0.1PO4F has a 2-D layered structure composed of a pair of Fe(Mn)O4F2 octahedrons through fluorine ion sharing, similar to that of Na2FePO4F. The temperature dependence of the zero-field-cooled (ZFC) and field-cooled (FC) curves was measured at temperatures ranging from 1.8 to 295 K under an applied field of 100 Oe. We confirmed that the Neel temperature was 2.5 K, which is lower than that of Na2FePO4F ( $T_{N} =3.4$ K). Mossbauer spectroscopy measurements at 4.2–295 K were conducted. At all the temperatures, the spectra were fitted with a double and were determined to be Fe2+ ions based on an isomer shift ( $\delta$ ). In addition, the large value of the electric quadrupole splitting ( $\Delta E_{Q}$ ) is explained by the asymmetric local environment of the Fe ions.
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