Publication
Title
Exploring the pressure-temperature behaviour of crystalline and plastic crystalline phases of N-isopropylpropionamide
Author
Abstract
The phase behaviour of crystalline and plastic crystalline phases of N-(isopropyl) propionamide (NiPPA) has been investigated by X-ray diffraction and a tentative P,T diagram has been constructed. The observed phase transitions are highly dependent on kinetics, and metastable co-existence of both phases can be observed. At lower pressures (up to 400 MPa) the plastic crystalline phase transforms into the crystalline phase as observed for other plastic crystalline systems, although the slopes (dT/dP) for both the liquid-to-plastic crystal and plastic crystal-to-crystal transitions are both positive and likely to run nearly parallel to each other. Higher pressures result in a highly anisotropic deformation of the crystal packing and at around 4 GPa the NiPPA crystals undergo a isosymmetric phase transition. An instability is observed at 350 K and 1400 MPa where the crystalline X-ray diffraction pattern is lost during heating accompanied by a rapid drop in pressure of the cell. This may correspond to a melting event characterised by a negative dT(m)/dP slope.
Language
English
Source (journal)
CrystEngComm
Publication
2015
ISSN
1466-8033
Volume/pages
17:12(2015), p. 2562-2568
ISI
000351765200016
Full text (Publishers DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 12.05.2015
Last edited 26.03.2017
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