This work investigates vortex dynamics and δl-pinning mechanisms in a Pb-doped Bi-2223 (BPSCCO) superconducting tape fabricated by the powder-in-tube method. The processed tape exhibits a significant enhancement in critical current density, reaching \({J}_{\text{C}}\approx 5.5\text{x}{10}^{4} \text{A}/{\text{c}\text{m}}^{2}\) at 10 K and 0.5 T, nearly 30% higher than the precursor powder. However, this improvement is accompanied by a shift of the irreversibility line to lower magnetic fields, indicating reduced vortex stability. Structural and microstructural analyses by X-ray diffraction (XRD) and scanning electron microscopy (SEM) reveal improved grain alignment induced by thermal and mechanical processing, together with the presence of secondary phases that define the effective pinning landscape. Magnetic relaxation analysis shows a transition in vortex dynamics, with the glassy exponent increasing from \(\mu \approx\) 0.3 (powder) to \(\mu \approx\) 0.7 (tape), consistent with a change from individual to collective-pinning regimes. These results demonstrate that processing-induced microstructural ordering promotes \(\delta l\) -pinning while simultaneously altering the \(B-T\) phase diagram. The findings highlight a trade-off between enhanced transport performance and reduced vortex stability in PIT-processed BPSCCO tapes.
