Simple Landau Model of the Liquid-RII-RI Rotator Phases of Alkanes

• 作者: Prabir K. Mukherjee Santanu Dey
• 来源期刊: 现代物理(英文)
• 学科: 数学
• 关键词: ROTATOR PHASES Phase TRANSITIONS LANDAU Theory
• 年，卷（期）: 2012,（1）
• 页码范围: 80-84
• 页数: 5页
• 分类号: O1

摘要

Simple Landau free energy function is presented to describe the Liquid-RII-RI phase sequence of alkanes and transitions between them. The order parameters necessary to describe these rotator phase transitions are identified. We present a mean-field description of the Liquid-RII and Liquid-RI transitions. General arguments are presented for the topology of the phase diagram in the vicinity of the Liquid-RII-RI triple point. Within this model the Liquid-RII and Liquid-RI transitions are found to be always strongly first order. Calculations based on this model agree qualitatively with experiments.