Koji Fukao 1996 J. Phys.: Condens. Matter 8 2105 doi:10.1088/0953-8984/8/13/003
Anomalous behaviour in the phase transition and crystal structure of urea adducts with n-eicosane
Koji Fukao
Show affiliationsX-ray diffraction measurements are made for urea adducts with n-eicosane to investigate the arrangement of n-eicosane molecules in the channels formed by urea molecules. Extra Bragg reflections have been found on the layers with the 
-coordinate corresponding to twice the chain length of the n-eicosane molecule in both the low- and high-temperature phases. This kind of Bragg reflection has not been observed for other n-alkanes in urea adducts. On the basis of the intensity distribution of the extra Bragg reflections, it is found that the n-eicosane molecules are arranged in such a way that the orientations of zigzag planes of longitudinally neighbouring molecules are anti-parallel to each other.
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Issue 13 (25 March 1996)
Received 27 November 1995, in final form 2 February 1996
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Anomalous behaviour in the phase transition and crystal structure of urea adducts with n-eicosane
Koji Fukao 1996 J. Phys.: Condens. Matter 8 2105
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