Tracer Diffusion of Lead in Lead Telluride

Abstract

Using radio-tracer 2l0Pb, the diffusion of lead has been studied in PbTe at 700°C as a function of composition and doping level. The results indicate that the predominant cation defect is of the Frenkel type.

Transmission electron microscopy study of Pb-depleted disks in PbTe-based alloys

“…Accordingly, it is reasonable that Pb atoms are much easier than Te to jump out of their original positions and form Frenkel disorder. 18,19 The Pb atoms may aggregate due to the metallic bonding and then form Pb precipitates [see the inset in Fig. 1(c)].…”

A comparison of phase equilibria in some II-IV-VI compounds based on PbTe

“…There is some evidence from diffusion data that the ionized Frenkel defect is predominant in lead rich material [4][5][6][7][8]. However, we have assumed Schottky disorder in the analysis presented here (Section 3).…”

TheP-T-x phase diagram of PbTe and PbSe

“…[2] assumed Schottky disorder to predominate in PbS at high temperatures but lead interstitials have been deduced as being present in all three lead chalcogenides from tracer diffusion experiments as a function of non-stoichiometry [25][26][27][28][29]. Density and lattice parameter measurements also indicate that lead interstitials and not selenium vacancies are the most abundant defect in lead-rich PbSe [30].…”

“…In fact, the diffusion experiments indicate that the defect structure consists of Frenkel defects on the cation sublattice, i.e. lead interstitials, for leadrich [25][26][27][28][29] and lead vacancies for chalcogenrich lead chalcogenides [25,31,32].…”