title: Urea and deuterium mixtures at high pressures.
abstract: Urea, like many network forming compounds, has long been known to form inclusion (guest-host) compounds. Unlike other network formers like water, urea is not known to form such inclusion compounds with simple molecules like hydrogen. Such compounds if they existed would be of interest both for the fundamental insight they provide into molecular bonding and as potential gas storage systems. Urea has been proposed as a potential hydrogen storage material [T. A. Strobel et al., Chem. Phys. Lett. 478, 97 (2009)]. Here, we report the results of high-pressure neutron diffraction studies of urea and D2 mixtures that indicate no inclusion compound forms up to 3.7 GPa.
authors.affiliation: Centre for Science at Extreme Conditions and School of Physics and Astronomy, The University of Edinburgh, Erskine Williamson Building, Peter Guthrie Tait Road, The King's Buildings, Edinburgh EH9 3FD, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Donnelly
authors.affiliation: ISIS, Rutherford Appleton Laboratory, Oxford Harwell, Didcot OX11 0QX, United Kingdom.
authors.forename: C L
authors.initials: CL
authors.lastname: Bull
authors.affiliation: Centre for Science at Extreme Conditions and School of Physics and Astronomy, The University of Edinburgh, Erskine Williamson Building, Peter Guthrie Tait Road, The King's Buildings, Edinburgh EH9 3FD, United Kingdom.
authors.forename: R J
authors.initials: RJ
authors.lastname: Husband
authors.affiliation: Centre for Science at Extreme Conditions and School of Physics and Astronomy, The University of Edinburgh, Erskine Williamson Building, Peter Guthrie Tait Road, The King's Buildings, Edinburgh EH9 3FD, United Kingdom.
authors.forename: A D
authors.initials: AD
authors.lastname: Frantzana
authors.affiliation: IMPMC, CNRS UMR 7590, Université P & M Curie, 4 Place Jussieu, 75252 Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Klotz
authors.affiliation: Centre for Science at Extreme Conditions and School of Physics and Astronomy, The University of Edinburgh, Erskine Williamson Building, Peter Guthrie Tait Road, The King's Buildings, Edinburgh EH9 3FD, United Kingdom.
authors.forename: J S
authors.initials: JS
authors.lastname: Loveday