掺杂金属离子对铁的有机物热解产物的影响及其机理  

EFFECTS OF DOPING METAL IONS ON PYROLYSIS PRODUCT OF FERRIC ORGANIC COMPOUNDS AND ITS MECHANISM

作　　者：吴东辉[1] 施新宇[2] 汪信[1] 

机构地区：[1]南京理工大学材料化学研究室,南京210094 [2]南通工学院化工系,江苏南通226007

出　　处：《硅酸盐学报》2005年第4期428-432,共5页Journal of The Chinese Ceramic Society

基　　金：江苏省自然科学基金(BK2002100)资助项目。

摘　　要：系统研究了掺杂金属离子对硬脂酸铁热解产物的影响。结果显示:影响热解产物的因素不仅与掺杂离子的半径有关,而且还与其离子的电荷及电子构型有关,即掺杂离子极化力的大小决定热解产物的种类。当掺杂离子的极化力较小时,其对应的硬脂酸盐热解形成的碳酸盐能稳定存在,从而有利于生成γFe2O3;反之则有利于生成αFe2O3。通过实验还发现:运用该观点同样可以很好地解释掺杂金属离子对其它铁的有机物热解产物的影响,提出对γFe2O3起稳定作用的主要原因可能在于掺杂金属离子有机物热解形成的、处于γFe2O3晶体表面的CO32-。Effects of doping metal ions on the pyrolysis product of ferric stearin acid were systematically studied. Results show that it is not only the doping ionic radius, but also ionic electric charge and electron configuration which affect the pyrolysis product. In other words, doping ionic polarizing power determines the type of pyrolysis product. When the doping ionic polarizing power is lower, the carbonate formed corresponding by pyrolysis of doping ion stearin acid salt is stable and it is favorable to form γ-Fe2O3, whereas when the polarizing power is higher, it is favorable to form α-Fe2O3. The influence of doping metal ions on the pyrolysis products of other ferric organic compounds is also explained perfectly by this opinion. It is proposed that carbonate on the surface of γ-Fe2O3 crystal formed by pyrolysis of doping ion organic compounds is the main reason for stabilizing γ-Fe2O3.

关 键 词：三氧化二铁 热解 稳定作用 机理 

分 类 号：TQ174.758[化学工程—陶瓷工业]