离子晶体中固溶胶粒的形成和生长以及施主原子浓度(Ⅱ)

本文在前文的基础上进一步讨论了固溶胶粒的生长和施主原子浓度等问题。本文先讨论施主原子浓度的特性,证明它与杂质浓度无关;在胶粒生长后期,施主原子浓度可以近似地用杂质临界浓度表示。施主原子与胶粒的“平衡”,并不意味着系统的自由能处于极小,而是继续缓慢下降,因而在“平衡”条件下测得的施主原子浓度具有一定的零散度。进而从原子扩散角度描述小胶粒缩小和大胶粒生长的物理图象,并讨论了粒子的线度生长速率;接着讨论胶粒有一定分布时的情况。具体讨论了KCl,KBr,KI和NaCl的临界状态,及其有关参量E_β,β。再后就热凝聚和光凝聚等问题进行一些讨论。

FORMATION AND GROWTH OF COLLOIDAL PARTICLES AND CONCENTRATION OF DONOR ATOMS IN IONIC CRYSTALS (II)

In this paper the characteristics of the concentration of donor atoms in ionic crystal with colloidal particles are discussed. It is shown that the concentration of donor atoms is independent of the concentration of impurity. At the late period of growth of colloidal particles, the concentration of donor atoms can be approximately represented by the critical concentration of impurity. At that period the "equilibrium" between donor atoms and colloidal particles does not imply that the free energy of the system is located at its minimum point, and it implies that the free energy of the system decreases slowly. From the point of view of diffusion of impurity atoms the physical picture of the growth of colloidal particles is described, and the growth speed of colloidal particle is discussed.The critical states and parameters E_β, β for KC1, KBr, KI, and NaCl are discussed quantitatively, and the thermal coagulation and the optical coagulation are discussed qualitatively.It is pointed out that all discussions can be applied in the atomic crystals and alloys after some corrections.