Enhancement of critical current of SiC and malic acid codoped MgB2∕Fe wires

Abstract

The influences of microstructure, connectivity, and disorder on the critical current density, [Formula: see text], are discussed to clarify the different mechanisms of [Formula: see text] in different magnetic field ranges for in situ and combined in situ/ex situ [Formula: see text] wires with nano SiC and malic acid codoping. Sintering temperature plays a very important role in the electromagnetic properties at different temperatures and under various magnetic fields. Connectivity, upper critical field, [Formula: see text], and irreversibility field, [Formula: see text], are studied to demonstrate the mechanism of [Formula: see text] dependence on magnetic field. The combined in situ/ex situ process is proved to be a promising technique for fabrication of practical [Formula: see text] wires.