Structural evolution versus temperature of the beta(0) phase of the n-eicosane/n-docosane system: Rotator transitions

被引：12

作者：

Dirand, M

AchourBoudjema, Z

机构：

[1] Laboratoire de Thermodynamique Chimique et Appliquée, Ecole Nationale Supérieure des Industries Chimiques, Institut National Polytechnique de Lorraine, 54001 Nancy Cedex, 1, Rue Grandville

来源：

JOURNAL OF MOLECULAR STRUCTURE | 1996年 / 375卷 / 03期

关键词：

D O I：

10.1016/0022-2860(95)09050-9

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The orthorhombic phase beta(0)[n-C20H42/n-C22H46] (Fmmm) determined by Gerson and Nyburg is isostructural with the orthorhombic Rotator phase beta-RI (Fmmm), observed in n-tricosane (n-C23H48) and n-pentacosane (n-C25H52) and in the two binary systems: [n-C22H46/n-C24H50] and [n-C24H50/n-C26H54]. When the temperature increases, its b/a ratio changes progressively from 1.51 at 293 K to 1.73 at 309 K; it then transforms into the rhombohedral Rotator phase alpha-RII (R (3) over bar m) just below the solidus curve. These observations allow generalization of structural behaviour of two n-alkane mixtures (19 < n < 27), whose difference between carbon numbers is equal to 1 or 2.

引用

页码：243 / 248

页数：6

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