G S Pawley and O W Dietrich 1975 J. Phys. C: Solid State Phys. 8 2549 doi:10.1088/0022-3719/8/16/008
G S Pawley and O W Dietrich
Show affiliationsA solid-state phase transformation in octafluoronaphthalene has been discovered at 266.5K on cooling, and at 15K higher on heating. The symmetry of both phases is found to be the same, namely monoclinic with space group P21/c. The unit cell parameters change by up to 10%, but the integrity of a single crystal, which shatters on cooling, is good enough for a single-crystal structure determination. This has been done in both phases to a sufficient accuracy that a mechanism for the transformation can be proposed. Molecules which lie parallel to one another shear to a new parallel position, the shear movement being equal to one carbon-carbon bond of the naphthalene skeleton. In this process the molecules reorient, but are still related by the same symmetry operations. This transformation, although not unique, is probably the first of its kind to be discovered in molecular systems.
64.70.K- Solid–solid transitions
61.50.Ah Theory of crystal structure, crystal symmetry; calculations and modeling
61.50.Ks Crystallographic aspects of phase transformations; pressure effects
Issue 16 (21 August 1975)
G S Pawley and O W Dietrich 1975 J. Phys. C: Solid State Phys. 8 2549
I Zaharieva et al 2009 J. Phys.: Conf. Ser. 190 012142
Preeti Parashar and Swapan Rana 2009 J. Phys. A: Math. Theor. 42 462003
J A Peacock and J W Stairmand 1983 J. Phys. E: Sci. Instrum. 16 571
S Simons 1997 J. Phys. A: Math. Gen. 30 755
Bor-Yuan Shew et al 2005 J. Phys. D: Appl. Phys. 38 1097
Zheng-Jian Bai et al 2004 Inverse Problems 20 1675
T Harko and M K Mak 2004 Class. Quantum Grav. 21 1489
M G Cox et al 2006 Metrologia 43 S268
M Sipilä et al 2007 New J. Phys. 9 368