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The diffraction of x-rays by the crystalline n -paraffins, C 36 H 74 , C 44 H 90 , and C 94 H 190 , was examined at small angles - below seven degrees 2 θ - as a function of temperature. The Bragg maxima (00 l ) that occur at these angles result from a lamellar repeat distance which depends on the molecular length. In general the intensity of these maxima was found to increase with increasing temperature in an approximately reversible manner. All the samples experienced solid-solid phase transitions in the temperature range of observation. Several possible mechanisms consistent with the temperature dependence of the intensity are considered.

journal of research of the national bureau of standards. section a. physics and chemistry

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