调制结构特性的定量描述

Quantitative Description of Modulated Structures

本文以一维沿方向调制结构为例,定量地说明非公度调制机理。介绍一维调制结构的四维空间描述方法。详细地讨论了有关调制波的若干参数,如波矢量、波长、幅角、位相等。推导出不含对称性关系的三维和四维结构因子的一般形式表示式。

Based on the previous paper (ref. [2]), incommensurate modulation machnism is illustrated quantitatively taking one-dimensionally (along direction) modulated structure for example. An intensive discussion is presented of the four-dimensional description for one-dimensionally modulated structures. Several parameters related to modulation wave, such as wave vector, wave length and argument phase etc. , are also depicted in fairly detail. General structure-factor formulas for both 3-dimension and 4-dimension have been derived for one-dimensionally modulated structures without consideration of symmetries.