Abstract: The critical current density and trapped flux density of REBa2Cu3O7-δ high-temperature superconductor bulks are essential for the engineering applications. Introducing secondary-phase inclusions into the superconducting matrix is regarded as an effective way to form the pinning centers. It could enhance the critical current density and trapped flux density, improving the microstructure and the mechanical properties. In this paper, we discussed the research results about the second-phase doping of the REBCO superconductor in recent years. The change of the REBCO superconducting performance caused by the doping was analyzed. It will provide possible theoretical basis for the practical application of superconductor bulks.
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