No abstract

No abstract

The crystallographic long c parameter of the binary and ternary f l , f12, f l , intermediate solid solutions (n-C22H46 + n-C23H48 + n-CZ4H5,,) is approximately equal to the average c parameter of mixture equivalent orthorhombic pure n-alkanes: this finding shows that the longer n-alkane chain is not straight in unit cell of the mixture, but flexible near the chain end, as earlier observed from spectroscopy analyses by other authors. Four ternary isothermal sections were determined at 305K, 308K, 311 K and 313K from binary diagram data and differential scanning calorimetry and X-ray diffraction analyses of thirty ternary mixtures: the ternary intermediate solid solutions undergo the same first-order solid -solid eqyilibrium transitions as those of binary alloys with the observation of p(Fmmm)-RI and (r(R3m)-RII Rotator states below the solidus point.

The ternary phase diagram of the mixtures n-C22H46: n-C23H48: n-C24&0 has been established at 293 K by X-ray diffraction experiments on forty one samples. This study indicates the existence of limited terminal solid solutions in the neighbourhood of three pure n-alkanes and three domains of intermediate phases, identical to those observed in the binary systems and denoted / 3' , , fl, f12: on the basis of powder X-ray diffraction photographs, the patterns of the phases pi and P; are indistinguishable and these two intermediate solid solutions on both sides of the middle intermediate phase P; are isostructural as in the binary systems.

No abstract