Electric resistivity measurements of sb₂te₃ and ge₂sb₂te₅ melts using four-terminal method

In this work, we aim to determine the electric resistivities of liquid Sb₂Te₃ and Ge₂Sb₂Te₅. Electric resistivities were measured using the fourterminal method. First, the electric resistivities of liquid Ga and Sn were measured to establish this method. Second, the electric resistivities of Sb₂Te₃ and Ge_1:6Sb_2:0Te_5:0 were measured over temperature ranges between the respective melting temperatures of samples and 1020 K. The electric resistivity of Sb₂Te₃ has been determined to be 4:36≥0:14 μΩm at 992 K. The uncertainty was determined on the basis of the guide to the expression of uncertainty in measurement. The electric resistivity of Ge_1:6SbSb_2:0Te_5:0 is smaller than that of Sb₂Te₃. It is also found that both resistivities decrease with an increase in temperature; which indicates that both liquid materials behave as a semiconductor. Therefore, the pseudogap model was applied to derive the electrical activation energies.