The Sb-Te (antimony-tellurium) system

In this work, we aim to determine the electric resistivities of liquid Sb2Te3 and Ge2Sb2Te5. Electric resistivities were measured using the four-terminal method. First, the electric resistivities of liquid Ga and Sn were measured to establish this method. Second, the electric resistivities of Sb2Te3 and Ge1.6Sb2.0Te5.0 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 µΩ m at 992 K. The uncertainty was determined on the basis of the guide to the expression of uncertainty in measurement. The electric resistivity of Ge1.6Sb2.0Te5.0 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.

https://iopscience.iop.org/article/10.1143/JJAP.49.065802/pdf

Electric Resistivity Measurements of Sb2Te3 and Ge2Sb2Te5 Melts Using Four-Terminal Method

The electrical conductivity and thermoelectric power of the molten In-Te system have been measured as a function of concentration and temperature. The electrical conductivity shows a minimum around the stoichiometric composition In2Te3. The temperature coefficient of the conductivity is positive between 30 and 100 at.% Te and shows a maximum at the composition In2Te3. The values of thermoelectric power are positive and large for the semiconducting region of the system.

Electrical properties of the molten In-Te system

The magnetic susceptibilities of the liquid Ga–Te, In–Te and Tl–Te systems have been measured as a function of concentration and temperature. Curves of the susceptibilities of these alloys for all concentrations show rather a large deviation from the linearly interpolated ones at the compositions near Ga 2 Te 3 , In 2 Te 3 and Tl 2 Te. From these results, the range of the localization of electrons is also discussed.

Magnetic Susceptibilities of liquid Te Alloys

Results are reported for the resistivity and thermoelectric power of three binary alloy systems in the liquid state, Ga-Te, Ge-Te, and Pb-Te. In two of these systems there is clear evidence for what may loosely be termed ‘compound formation’, at concentrations corresponding to Ga2Te3 and PbTe, and there is some sign that GeTe2 exists as a compound in the third. An attempt is made to classify the numerous Te-based systems which have now been studied in the liquid state, nearly all of which show evidence for compound formation, according to the nature of the bonding mechanism involved. The way in which the thermoelectric power varies with concentration is qualitatively the same for all the systems within one group, but there are significant differences between one group and the next.

The resistivity and thermoelectric power of liquid alloys containing tellurium

The binary alloy systems In-Sb, Bi-Te, Sb-Te and In-Te have been investigated in respect of their electrical conduction propertics in the liquid state. Measurements of resistivity, thermoelectric power and Hall coefficient have been made and indicate the existence of strong positional correlation of ions in the liquid state. This occurs for a range of alloy compositions, not only in the stoichionietric phases.

R. Blakeway

Papers

Electronic properties of liquid binary alloys