Phase transitions in the litharge and antilitharge structures |
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| Authors: | David M. Adams Andrew G. Christy Julian Haines |
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| Affiliation: | Department of Chemistry , University of Leicester , Leicester, LE1 7RH, England |
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| Abstract: | Abstract The compounds PbO and LiOD possess the layered, tetragonal B10 structure and the corresponding antistructure respectively at 1 bar. They undergo very different phase transitions at moderate pressure. At 5 kbar, PbO undergoes a slight, reversible distortion to an orthorhombic phase. The structure is probably an expanded NaCl derivative. The high-P LiOD phase begins to grow slowly above 17 kbar. Infrared and Raman data indicate that hydrogen bonding is present in the new phase. Neutron powder data indexed on a monoclinic cell. The structure is likely to be similar to that of T1I and NaOH, distorted by the H-bonding. |
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