In this investigation, samples of the chemical (Hg1-xPbxBa2Ca1.8Mg0.2Cu3O8+δ) were prepared utilizing a solid-state reaction technique with a range of lead concentrations (x = 0.0, 0.05, 0.10, and 0.20). Specimens were pressed at 8 tons per square centimeter and then prepared at 1,138 K in the furnace. The crystalline structure and surface topography of all samples were examined using X-ray diffraction (XRD) and atomic force microscopy (AFM). X-ray diffraction results showed that all of the prepared samples had a tetragonal crystal structure. Also, the results showed that when lead was partially replaced with mercury, an increase in the lead value impacted the phase ratio, and lattice parameter values. The AFM results likewise showed excellent crystalline consistency and remarkable homogeneity during processing. The electrical resistivity was calculated as a function of temperature, and the results showed that all samples had a contagious behavior, as the resistivity decreased with decreasing temperature. The critical temperature was calculated and found to change, from 102, 96, 107, and 119 K, when increasing the lead values in the samples from 0.0 to 0.05, 0.10, and 0.20, respectively.

1. Introduction
2. Experimental Procedure
3. Results and Discussion
    3.1. Structural characteristics
    3.2. The electrical characteristics
    3.3. Microscopic results of atomic forces
4. Conclusion
References
Author Information

• Kareem Ali Jasim(Department of Physics, College of Education for Pure Sciences Ibn Al-Haitham, University of Baghdad, Baghdad 10001, Iraq) Corresponding author
• Chaiar Abdeen Zaynel Saleh(Directorate of Education Kirkuk, Education Department of Kirkuk, Alta’meem 36001, Iraq)
• Alyaa Hamid Ali Jassim(Directorate of Education Salah Uddin, Education Department of Tuz, Salah Aldeen 34001, Iraq)