Neutron-scattering study of phase transition in norbornylene and DL-norcamphor
Hołderna-Natkaniec K.1, Natkaniec I.2,3, Khavryutchenko V.2,4
- 1Institute of Physics, A.Mickiewicz University, Ul. Umuttowska 85, 61-616 Poznan, Poland
- 2Frank Laboratory of Neutron Physics, JINR, 141980 Dubna, Russian Federation
- 3H. Niewodnic:anski Inst. Nucl. Phys., 31-342 Krakow, Poland
- 4Institute of Surface Chemistry, National Academy Science Ukraine, 252028 Kiev, Ukraine
Physica B: Condensed Matter, 241-243, pp.478-480, 1997
DOI::
Abstract:
Neutron diffraction (ND) and inelastic incoherent scattering (IINS) were performed on solid norbornylene and DL-norcamphor in the temperature range from 10 to 290 K. The first-order structural phase transition was observed in norbornylene at ca. 140 K, by both ND and quasielastic scattering (QNS). For DL-norcamphor the ND pattern does not change on cooling, but at ca. 140 K, the QNS indicates a transition in the reorientations of the molecules. This phase (plastic phase II) persists up to liquid-He temperatures. Upon heating above 100 K, a new structure, phase III, appears in the ND pattern. Phase III is stable at low temperatures up to 160 K and, upon further heating, it transforms into phase II. The IINS spectra measured at 12 K suggest that the phase III is more densely packed than phase II. © 1998 Elsevier Science B.V. All rights reserved.
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