Title: The phase transition of Pb8F14I2
Language: Deutsch
Authors: Weil, Matthias 
Category: Research Article
Issue Date: 2017
Journal: Monatshefte für Chemie - Chemical Monthly
ISSN: 1434-4475
The reversible phase transition of Pb8F14I2 is of continuous type and takes place at about 107 °C as monitored by temperature-dependent single crystal and powder X-ray diffraction measurements, optical microscopy, and differential scanning calorimetry. The low-temperature ferroelastic phase crystallizes in the orthorhombic crystal system (23 °C, Bmmb, Z = 2, a = 6.0699(6) Å, b = 6.0165(6) Å, c = 25.077(2) Å, 1487 structure factors, 41 parameter, R(F 2 ) = 0.0346, wR(F 2) = 0.0771) and changes its symmetry to the tetragonal crystal system into the high-temperature paraelastic phase (130 °C, I4/mmm, Z = 1, a = 4.2667(12) Å, c = 25.388(7) Å, 430 structure factors, 303 parameter, R(F 2 ) = 0.0575, wR(F 2) = 0.1564). Group–subgroup relationships between the two structures and a hypothetical intermediate structure are presented.
Keywords: Lead fluoride halide; Crystal structure determination; Thermal analysis; Group–subgroup relationships
DOI: 10.1007/s00706-016-1854-z
Library ID: AC15173475
URN: urn:nbn:at:at-ubtuw:3-3856
Organisation: E164 - Institut für Chemische Technologien und Analytik 
Publication Type: Article
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