The effects of both magnetic field and temperature on the magnetic hysteresis of (Zn_0.95Ni_0.05O)_x/(Cu_0.25Tl_0.75)Ba₂Ca₃Cu₄O_{12 − δ}, x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 wt.%, were studied. The magnetic parameters such as the lower “H_c1” and the upper “H_c2” critical magnetic fields, the zero temperature coherence length [ξ(0], the coercive field H_coer., the remanent magnetization M_r, the vertical width Δ M, the magnetic critical current density J_c.mag, and the flux pinning density F_p were extracted from the analysis of the hysteresis loops. The experimental data of the J_c.mag were analyzed according to the power law, Kim model, and the exponential model. The results showed that the exponential model is more convenient in describing the obtained data than the power law and Kim models. In addition, with increasing the applied magnetic field, the samples containing nano-Zn_0.95Ni_0.05O were degraded less compared with the pure sample (Cu_0.25Tl_0.75)-1234. Thus, nano-Zn_0.95Ni_0.05O-addition to (Cu, Tl)-1234 had a significant effect on improving J_c.mag values.

磁场和温度对（Zn _0.95 Ni _0.05 O）_x /（Cu _0.25 Tl _0.75）Ba ₂ Ca ₃ Cu ₄ O _12-δ的磁滞的影响，x  = 0.0、0.2、0.4、0.6、0.8研究了1.0wt。％。磁性参数，例如下部“ H _c1 ”和上部“ H _c2 ”临界磁场，零温度相干长度[ξ（0]，矫顽场H _coer。，剩余磁化强度M _r，垂直宽度Δ 中号从磁滞回线的分析中提取了磁临界电流密度J _c.mag和磁通钉扎密度F _p。根据幂定律，Kim模型和指数模型分析了J _c.mag的实验数据。结果表明，指数模型比幂定律模型和金模型更方便描述获得的数据。另外，随着施加磁场的增加，与纯样品（Cu _0.25 Tl _0.75）-1234相比，含纳米锌_0.95 Ni _0.05 O的样品降解得更少。因此，纳米锌_0.95 Ni _0.05（Cu，Tl）-1234的O-添加对改善J _c.mag值具有显著作用。