Investigation of Pinning Force Density Fp and Critical Current Density Jc of Nd0.33Eu0.33Gd0.33Ba2Cu3Oy(NEG-123) Superconductors with Addition of 211 Phase Particles and Analysis with a Theoretical Evaluation Based on Flux Creep-Flow Model. The Chittagong Univ. J. Sci. 2021;42(1):24-38. doi:10.3329/cujs.v42i1.54236