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

Autor:	Wulf Depmeier, Karsten Knorr, Przemyslaw Dera, Oleg I. Siidra, Robert Minch, Lars Ehm, Vitali B. Prakapenka, Lars Peters
Rok vydání:	2010
Předmět:	Inorganic Chemistry Diffraction Crystallography Phase transition Polymorphism (materials science) Chemistry X-ray crystallography X-ray General Materials Science Orthorhombic crystal system Crystal structure Condensed Matter Physics Monoclinic crystal system
Zdroj:	Zeitschrift für Kristallographie. 225:146-152
ISSN:	0044-2968
DOI:	10.1524/zkri.2010.1194
Popis:	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 P121/c1. The cell parameters at p = 8.90(5) GPa are a = 5.101(1) Å, b = 8.303(3) Å, c = 5.602(2) Å, β = 89.51(4)°, Z = 4. The transformation is supposed to be of 2nd order.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::ca8edd6cb7b88c45b0f9ac8c5f879259 https://doi.org/10.1524/zkri.2010.1194 Zobrazit plný text záznamu