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The intensity as a function of temperature of the low-angle x-ray diffraction maxima of the n-paraffins: Hexatriacontane, tetratetracontane, and tetranonacontane

1970; The National Institute of Standards and Technology; Volume: 74A; Issue: 2 Linguagem: Inglês

10.6028/jres.074a.015

2376-5704

Peter K. Sullivan, James J. Weeks,

Advanced X-ray Imaging Techniques

The diffrac tion of x-rays by the crystalline n-paraffin s, C36 H ' 4 , C4.H"o, and C".H ",o, was examin e d a t s mall angles -be low se ve n deg re es 2IJ -as a fun c tion of te mp e rature.The Bragg maxima (001) that occ ur at these ang les res ult from a la mell a r re peat di sta nce whic h de pe nd s on th e molec ul a r length.I n ge ne ral the inte nsity of th ese maxim a was found to inc rease with increas ing te mp e rature in a n approximately re versible manne F. All the samp les exp e rie nce d so lid-so lid ph ase tra nsitions in th e te mperature ran ge of observa tion.S eve ral possibl e mecha ni s ms co ns iste nt with th e te mp e rature d e pendence of the inte nsity are considered .