3.9 Article

Evidence for the existence of a PbCO3-II phase from high pressure X-ray measurements

Journal

Publisher

WALTER DE GRUYTER GMBH
DOI: 10.1524/zkri.2010.1194

Keywords

High pressure; X-ray diffraction; Phase transition; Lead carbonate

Funding

  1. Deutsche Forschungsgemeinschaft [KN 507/5-1]
  2. National Science Foundation - Earth Sciences [EAR-0622171]
  3. Department of Energy - Geosciences [DE-FG02-94ER14466]
  4. U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
  5. RF programme [02.740.11.0326]

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The high-pressure room temperature behavior of PbCO3 was investigated by angle-dispersive synchrotron powder diffraction up to 16.16(5) GPa. A phase transition to a high-pressure polymorph II of lead carbonate was observed at a pressure of approximately p(c) = 8.7 GPa. Thereby, the symmetry is reduced from orthorhombic Pmcn to monoclinic P12(1)/c1. The cell parameters at p = 8.90(5) GPa are a = 5.101(1) angstrom, b = 8.303(3) angstrom, c = 5.602(2) angstrom, beta = 89.51(4)degrees, Z = 4. The transformation is supposed to be of 2(nd) order.

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