<p>In the current paper, the effect of nano Eu particle (80&#xa0;nm) substitution (<i>x</i> = 0.00, 0,025, 0.050, 0.1 and 0.15) in the Bi_1.7Pb_0.3Sr₂Ca₁Cu_1.75Na_0.25O_y on the structural, morphological, magnetic and superconductivity properties was investigated. The solid-state reaction method was used for producing the ceramic samples. The X-ray diffraction (XRD) analysis shows that the Bi-2223 phase with a tetragonal structure is the main phase structure in the ceramic samples. A flaky plate structure separated by grain boundaries has been observed in the scanning electron microscope (SEM). It was found that the grain sizes expanded and the inter-grain bonding increased when nano-sized Eu is added in the host structure. In magnetic hysteresis (<i>M-H</i>) measurements, diamagnetic behaviour, which is characteristic of the Bi-2223 superconductor phase, was observed in all samples. The sample with the best diamagnetic behaviour was substituted with Eu nano particle at a rate of <i>x</i> = 0.1, resulting in an increase in the hysteresis field with the formation of intergranular bonds. Based on <i>M-H</i> measurements performed at temperatures of 15&#xa0;K and 25&#xa0;K, the samples’ critical current density (<i>J</i>_c) was determined using the Bean model. The highest critical current density value was calculated in the sample substituted with nano-sized Eu at <i>x</i> = 0.1 rate as a result of improving intergranular connections. Flux pinning forces (<i>F</i>_p) were determined from <i>J</i>_c and <i>B</i> values. Nano-sized Eu particles at a ratio of <i>x</i> = 0.1 improved the pinning forces by acting as flux pinning centres.</p>