摘要
以微观结构能带理论和非整比化合物点缺陷等概念,研究了非整比金属氧化物(Zn_(1-x)O,O,Fe_(1-x)O等)对α-Pb(N_3)_2,热分解影响的微观机理,并做了实验验证。指出:通过掺杂的非整比n-型氧化物与p-型氧化物对α-Pb(N_3)_2,热分解的作用是完全相反的。p-型氧化物生成的准自由空穴,通过界面向α-Pb(N_3)_2晶格中扩散,空穴数目增加,生成更多的N_3自由基、导致热分解速度加快。n-型氧化物生成的准自由电子,通过界面向α-Pb(N_3)_2晶格扩散,与N_3自由基相复合,形成N_3^-离子。从而减少N_3自由基的浓度,使分解速度减慢。其实际意义在于优选耐热起爆药掺杂材料,有效控制α-Pb(N_3)_2的慢速热分解提供依据。
Based on views from the microstructure , energy band and nonstoichio-metric compound defect theory ,the authors have investigated the micro- mechanism of the effect ofnonstoichiometric metallic oxides (such as Zn1+xO ,Fe1-xO etc)on the thermal decomposition of a - lead azide . The mechanism has partly been verified by experiments . It has been pointed out that the effect of the n-type nonstoichiochio-metric oxides on the thermal decomposition of α - lead azide is directly opposite to that of the p - type oxides . Quasi - free vacancies in the p - type oxides diffuse to the lattices of α - lead azide through the boundaries , which makes the number of vacancies in α - lead azide increase and more free azide radicals (N3·) created . As a result , the thermal decomposition rate of α - lead azide is accelerated . Quasi - free electrons in n - type oxides difiuse to the lattices of α - lead azide through the boun -daries , combining with free azide radicals to form N3- , consequently decelerates the decomposition rate of α - lead azide . The paper may have practical significance to supply a scientific basis in the selection of refractory adulternated materials and in the control of slow decomposition of α - lead azide .
出处
《北京理工大学学报》
EI
CAS
CSCD
1990年第3期87-92,共6页
Transactions of Beijing Institute of Technology
关键词
叠氮化铅
热分解
晶体缺陷
α - lead azide , thermal decomposition , crystal defects , metallic oxides / nonstoichiometric compound .
