一、Spinodal分解 1.1概述 除了形核长大型的沉淀方式外,还有一种非经典的spinodal分解的方式。这两种方式早在上一世纪已由吉布斯(W.Gibbs)所指出。 在前一种方式中,热涨落引起的成分起伏在沉淀初期就比较大,但起伏所涉及的范围不大。采用这种方式,热涨落就可能在系统中的某些地点形成新相的核心,核心的成分与基体的成分明显不同,并通过正常的顺扩散而进一步长大(见图8—1(a))这就是经典的形核长大方式,经典形核理论认为 First, Spinodal decomposition 1.1 Overview In addition to the nucleation and growth of large precipitation, there is a non-classical spinodal decomposition. Both approaches were pointed out by W. Gibbs as early as the last century. In the former method, the fluctuation caused by the thermal fluctuation is relatively large at the initial stage of precipitation, but the range involved in fluctuation is not large. In this way, thermal fluctuations may form the nucleus of a new phase at some point in the system, with the core components being significantly different from the matrix components and growing further by normal paraffinic propagation (see Figure 8-1 ( a)) This is the classic way of nucleation and growth, classical nucleation theory that