eng Science and Education Publishing International Journal of Physics 2333-4576 2018-01-19 6 1 15 17 10.12691/ijp-6-1-3 IJP2018613 article Khalid Hamdi Razzeg 1 Sabah M. Ali Ridha 2 Chanar Abiden Zaynel 2 Department of Physics, College of Education for Pure Science, Tikrit University, Iraq Department of Physics, College of Education for Pure Science, Kirkuk University, Iraq This research involved the preparation of samples of Bi2-(x+y)PbxAgy Sr2Ca2Cu3O10+Ħ compounds and with different concentration of (x,y) which are (x=y=0) (x=0.05,y=0.15) (x=y=0.1) (x=0.15, y=0.05) by the method of solid state reaction under hydrostatic pressure of 8 ton/cm2 temperature of annealing 850 k to know the range of effect of partial substitution on the synthetic and electric properties of compound. After undergoing the test of x-ray diffraction, it looked like the best substitution ratio of pb and Ag in Bi is when (x=0.05,y=0.15 ) where the values of lattice dimensions were a=b=5.4056 c=37.4226 A? and the crystalline composite is of tetragonal type this research also revealed that the oxygen has a vital role in increasing the critical temperature, we noticed by studying the electrical properties the critical temperature in this substitution Tc=143 k. http://pubs.sciepub.com/ijp/6/1/3/ijp-6-1-3.pdf partial substitution electrical properties superconductor