Abstract
High pressure X-ray diffraction experiments have been performed on PbS, PbSe and PbTe up to 300 kbar with synchrotron radiation. PbS, PbSe and PbTe undergo pressure-induced first-order structural phase transition from NaCl-type (B1) phase to an intermediate phase at about 22, 45 and 60 kbar, respectively. Further structural phase transitions from the intermediate phase to the CsCl-type (B2) phase have been observed in PbS, PbSe and PbTe at about 215, 160 and 130 kbar, respectively. The crystal structures of the intermediate phases of these compounds are discussed.
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