Abstract
IN the course of an investigation concerning the semiconducting properties of lead sulphide, single crystals were prepared and reheated under various sulphur pressures at 1,200° K. in order to control the deviations from the exact stoichiometric composition. The concentration of impurities in these crystals was less than 1017 cm.−3 (5 × 10−6 atom per mole lead sulphide).
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BLOEM, J., KRÖGER, F. A Relation between Hardness and Stoichiometry in Lead Sulphide Single Crystals. Nature 175, 861 (1955). https://doi.org/10.1038/175861a0
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DOI: https://doi.org/10.1038/175861a0
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