Abstract
The liquidus curve of the Pb-Te binary was measured using two different DTA systems, one employing a small sample (0.2 g) and the second a large sample (5 g). An additional liquidus measurement method was employed for the Pb-rich region in which the liquid equilibrated with PbTe was analyzed chemically. The liquidus for the Pb-PbTe subsystem obtained is in agreement with several sets of data reported in the literature. The literature data for the PbTe-Te are in disagreement. Our measured values resolve this discrepancy and yield a eutectic temperature of 410.9±0.8°C at 89.1±0.3 at % Te. The system was thermochemically modelled using an associated solution model for the liquid phase and a defect model for PbTe. This model not only accounts for compositional and temperature dependences of the thermodynamic data but also for electron and hole concentrations within the homogeneous range of PbTe(c).
Zusammenfassung
Die Liquiduskurve des Binärsystems Pb-Te wurde unter Verwendung von zwei verschiedenen DTA-Systemen (eines unter Anwendung kleiner Probenmengen von 0.2 g, das zweite für größere Probenmengen von 5 g) gemessen. Eine weitere Meßmethode wurde für die Pb-reiche Region herangezogen, wobei die mit Pb-Te äquilibrierte flüssige Phase chemisch analysiert wurde. Der erhaltene Liquidusverlauf für das Pb-PbTe-Subsystem ist mit verschiedenen Literaturdaten in Übereinstimmung. Die Literaturdaten für PbTe-Te sind allerdings abweichend. Unsere Meßdaten klären diese unterschiedlichen Angaben und ergeben eine eutektische Temperatur von 410.9±0.8°C bei 89.1±0.3 at% Te. Für das System wurde ein thermochemisches Modell unter Verwendung eines assoziierten Lösungsmodells für die flüssige Phase und eines Defektmodells für PbTe angewandt. Dieses Modell gab nicht nur die Zusammensetzungs- und Strukturabhängigkeiten der thermodynamischen Daten wieder, sondern auch die Elektronen- und Lückenkonzentrationen innerhalb des homogenen PbTe(c)-Bereichs.
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This paper is dedicated to Prof. Dr.Kurt L. Komarek on the occasion of his 60th birthday.
On leave from India Institute of Technology-Kanpur, Kanpur, India.
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Ngai, T.L., Marshall, D., Sharma, R.C. et al. Thermodynamic properties and phase equilibria of the lead-tellurium binary system. Monatsh Chem 118, 277–300 (1987). https://doi.org/10.1007/BF00809938
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DOI: https://doi.org/10.1007/BF00809938