HIGH-TEMPERATURE CRYSTAL-CHEMISTRY OF NORMAL-PARAFFINS WITH EVEN NUMBERS OF CARBON-ATOMS

Thermal deformations and phase transformations of even numbered paraff ins CnH2n+2 (n = 20, 22, and 24) have been investigated in a thermal X -ray diffraction study. In homologs with n = 20 and 24 phase transform ations occur in Mo steps: triclinic-to-orthorhombic and orthorhombic-t o-hexagonal transitions. An orthorhombic rotator phase of even n-paraf fins is described for the first time. A crystal-chemical model of the phase transformations of the homologs is suggested.