ABSTRACT:Ex-situ powder in tube manufacturing process is based on the filling of a metal sheath with presynthesized MgB2 powders. It is necessary for MgB2 used in wire manufacturing to have the required properties of grain size and connectivity. Synthesis temperature for MgB2 is an important parameter to improve the quality of powders and subsequently enhance performances of wire for large-scale applications. In this work we investigated the effect of synthesis temperature on morphology, and how this is reflected on superconducting properties. A detailed study on the influence of MgB2 synthesis temperature on grain size has been given, evaluated through SEM images and magnetic measurement, by applying a model for average grain size distribution based on the penetration of magnetic field in the superconductor, that was found to be in agreement with several other methodologies. Engineering current density has been evaluated from direct measurement using a four-probe configuration.
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