Measurement of the thermoelectric power of lead sulphide

  • Ali Ali Arafa
  • Ibrahim Sayed Shafie
  • Fathi Sultan Ahmed Sultan
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Abstract

The thermoelectric power of natural specimens of lead sulphide crystals has been measured between room temperature and 700° K. Specimens which are of then-type remain as such throughout the temperature range. Thep-type specimens, however, show an initial small rise followed by a gradual decrease and a subsequent change of sign ata temperature which, in some specimens, is well defined. Further increase of temperature results in a negative extremum. From this stage onwards there seems to develop a common behaviour for both types of specimens. Some crystals which were initially of thep-type changed over to then-type and remained as such throughout subsequent investigation. Among the crystals one showed a metallic conduction and an extraordinary large thermoelectric power.

Keywords

Sulphide Mathematical Method Gradual Decrease Thermoelectric Power Subsequent Change 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

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Copyright information

© Birkhäuser-Verlag 1956

Authors and Affiliations

  • Ali Ali Arafa
    • 1
  • Ibrahim Sayed Shafie
    • 1
  • Fathi Sultan Ahmed Sultan
    • 1
  1. 1.Physics Department, Faculty of ScienceAlexandria UniversityAlexandriaEgypt

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