Phase transitions in layer-intercalation compounds of nickel cyanide with n-alkylaminesReport as inadecuate




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Abstract : A two step modification phenomenon is observed, upon heating, within the intercalated chain system of the nickel cyanide-n dodecylamine compound : strong modifications of both X-ray diffraction patterns and IR spectra take place at 55 and 90 °C. The enthalpy of the observed transitions respectively solid-solid and solid-liquid are roughly in the ratio 4 to 1. The study of n alkylamines compounds from dodecyl to hexadecylamine shows that the parity of the number of C atoms of the alkylamine chain has a significant effect on the first transition.

Keywords : enthalpy infrared spectra of inorganic solids liquid crystal phase transformations melting nickel compounds organic compounds solid state phase transformations X ray diffraction examination of materials nickel cyanide n alkylamines two step modification intercalated chain nickel cyanide n dodecylamine X ray diffraction patterns IR spectra 55 degrees C 90 degrees C solid solid transition solid liquid transition





Author: Y. Mathey C. Mazières

Source: https://hal.archives-ouvertes.fr/



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