Ostwald规则与湿法锑白晶型控制

来源期刊：中南大学学报(自然科学版)2000年第2期

论文作者：张多默 肖松文 刘志宏 李启厚

文章页码：121 - 123

关键词：Ostwald规则;锑白;晶型;相变

Key words：ostwald rule; antimony white; polymorph; phase transformation

摘    要：根据相变的Ostwald规则等理论,阐明了常规三氯化锑水解中和转化工艺得不到立方晶型锑白的原因:Sb₄O₅Cl₂中和转化时,热力学低温亚稳定相———斜方晶型锑白首先出现,并因体系不能提供足够的能量,以克服晶型转变时原子移动的能垒,从而一直稳定存在.在中和转化前,添加少量EDTA、酒石酸等螯合剂控制氯氧锑的转化反应历程,是制取立方晶型锑白的最佳措施.

Abstract: Based on the Ostwald rule of phase transformations, the reason why cubic antimony white can′t be produced from the hydrolysis-neutralization of SbCl₃ is interpreted: during the neutralization transforming process of antimony oxychloride(Sb₄O₅Cl₂), the orthorhombic antimony white, the meta-stable phase at low temperature, is firstly formed, and exists stably all along in fact, because the system can′t supply enough energy to move the atoms for phase transformations. Adding a little ligand such as EDTA, tartrate before neutralization to change the transferring reaction course, is the best method of synthesizing cubic antimony white (Sb₂O₃) by hydro-process.