The effect of potassium substitution on the properties of HgBa2Ca2Cu3O8+δCompound

Abstract

Abstract This article reported investigations the effect of partial substitution potassium at calcium site for HgBa2Ca2Cu3O8+δ system with x from 0 to 0.2. All samples were prepared using solid state reaction technique. The samples were subjected to gross structural characterization by X-ray diffraction. The XRD data for the prepared samples are consistent with the Hg-1223 phases, and the analysis showed that the structures are tetragonal. Increasing potassium level results in decreasing the mass density (from 1.53 to 1.51), volume fraction (from 76.4 to 71.9), lattice parameters c, c/a length of c. Electrical resistance was testing by four-probe technique to determine the critical temperature, and it is noticed that the non-potassium HgBa2Ca2Cu3O8+δ compound has a critical temperature around 118 K, while introducing potassium in HgBa2Ca2-xKxCu3O8+δ compound with x=0.1 and 0.2 led to decrease the critical temperature to 110 K and 93 K, respectively.