High-Pressure High-Temperature Structural Properties of Urea

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Title: High-Pressure High-Temperature Structural Properties of Urea
Author(s): Dziubek, K
Citroni, M
Fanetti, S
Cairns, AB
Bini, R
Item Type: Journal Article
Abstract: Angle-dispersive X-ray diffraction and Fourier transform infrared spectroscopy have been employed to study the phase diagram of urea crystal beyond 15 GPa and at temperatures in excess of 400 K. Previously reported Bridgman phase II was structurally characterized for the first time, and it is discovered that it coincides with room-temperature phase IV. Large metastability P–T regions were identified for all phases in the sequence I–III–IV–V, ascribed to the difficulty to disrupt the H-bonding network, a prerequisite to accomplish the molecular rearrangement necessary for the structural transformation. High-temperature studies and use of a hydrostatic compression medium allows the thermodynamic boundaries of phase III, and partly of phase IV, to be identified therefore making a considerable step forward in the knowledge of the phase diagram of urea.
Publication Date: 2-Feb-2017
Date of Acceptance: 21-Dec-2016
URI: http://hdl.handle.net/10044/1/63063
DOI: https://dx.doi.org/10.1021/acs.jpcc.6b11059
ISSN: 1932-7447
Publisher: American Chemical Society
Start Page: 2380
End Page: 2387
Journal / Book Title: Journal of Physical Chemistry C
Volume: 121
Issue: 4
Copyright Statement: © 2017 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry C, after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/acs.jpcc.6b11059
Keywords: Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
CRYSTAL-STRUCTURE
PHASE
NITROMETHANE
DIFFRACTION
SOLIDS
STATE
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Nanoscience & Nanotechnology
Materials Science, Multidisciplinary
Chemistry
Science & Technology - Other Topics
Materials Science
CRYSTAL-STRUCTURE
PHASE
NITROMETHANE
DIFFRACTION
SOLIDS
STATE
09 Engineering
03 Chemical Sciences
10 Technology
Physical Chemistry
Publication Status: Published
Online Publication Date: 2017-01-04
Appears in Collections:Faculty of Engineering
Materials



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