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Pressure-induced orthorhombic structure of PbS
Andrzej Grzechnik1, Karen Friese
1Departamento de F´ısica de la Materia Condensada, Universidad del Pa´ıs Vasco, 48080 Bilbao, Spain. andrzej.grzechnik@ehu.es
Abstract:
The pressure-induced crystal structure of lead sulfide (PbS) above 2.2 GPa has been studied with single-crystal x-ray diffraction in a diamond anvil cell at room temperature. It has been found to be twinned and of the TlI type (Cmcm, Z=4), in which the Pb atoms are surrounded by seven S atoms in a capped trigonal prism coordination. The twin laws in relation to the parent B1 (NaCl) type structure (Fm ̄3m, Z=4) at atmospheric pressure have been discussed.
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