Abstract
AbstractThe bonding character of liquid lead telluride \text{PbTe} is thermodynamically investigated in detail. Its possibility as an ionic melt composed of cation {\text{Pb}}^{2+} and anion {\text{Te}}^{2-} is not acceptable, by comparing the ionization energy of \text{Pb} atom, electron affinity of \text{Te} atom and the ionic bonding energy due to the cation {\text{Pb}}^{2+} and anion {\text{Te}}^{2-} with the help of structural information. Solid lead telluride PbTe as a narrow band gap semiconductor might yield easily the overlapping of the tail of valence band and that of conduction one. And on melting, it becomes to an ill-conditioned metallic state, which concept is supported by the electrical behaviors of liquid Pb–Te alloys observed by the present authors. As structural information tells us about the partial remain of some sorts of covalent-type mono-dipole and poly-dipole of the molecule \text{PbTe}, all systems are thermodynamically explained in terms of a mixture of these molecules and cations {\text{Pb}}^{4+} and {\text{Te}}^{2+} and a small amount of the conduction electrons are set free from these elements based on the ternary solution model.
Highlights
In the glory days of liquid metals and alloys, the compoundforming liquid alloys have been investigated as one of the complicated systems in view of physics
The solid compound lead telluride PbTe is known as a narrow band gap semiconductor, it turns to be an ill-conditioned metallic alloy in the liquid state, because, for example, its
We have found in liquid lead telluride PbTe that there are two types in the nearest neighboring distance between Pb and Te atoms, that is, one is 0.24 nm and the other is 0.30 nm
Summary
In the glory days of liquid metals and alloys, the compoundforming liquid alloys have been investigated as one of the complicated systems in view of physics. Where IM is the energy required to remove two electrons from a gas-like lead atom Pb(g) atom and is equal to 2160.6 kJ/mol [4]. In the case that a gas-like tellurium atom Te(g) combines with two electrons set free from a gaslike lead atom Pb(g), that is, the electron’s affinity, Ex, of Te(g) is expressed as follows: Te(g) + 2 e→ Te2−(g) + Ex,. If we assume that liquid lead telluride PbTe is locally approximated to as the quasi-ionic-crystalline cubic structure of Pb2+Te2−, its lattice energy, UL (the ionic liquid forming Pb2+ Te2− ), is shown in the following form: UL. It is concluded that the liquid lead telluride PbTe is definitely not formed as an ionic liquid of Pb2+Te2−
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