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Preparation of LaFeAsO0.9F0.1 wires by the powder-in-tube method

We report that Fe sheathed LaFeAsO0.9F0.1 wires with Ti as a buffer were fabricated by the powder-in-tube (PIT) method for the first time. Compared to the common two-step vacuum quartz tube synthesis method, the PIT method is more convenient and safe for synthesizing the novel iron-based layered superconductors. Structural analysis by means of x-ray diffraction shows that LaFeAsO0.9F0.1 is the main phase in wires produced by this synthesis method. The transition temperature of the LaFeAsO0.9F0.1 wire is around 25 K. The micrograph shows a homogeneous microstructure with a grain size of 1–3 µm. The results suggest that the PIT process is promising for preparing iron-based layered superconductors.