Accession Number : AD0738551

Title :   Lattice Defects in Metastable Solids (Azides).

Descriptive Note : Final rept. 1 Feb 69-31 Jan 72,

Corporate Author : MARTIN MARIETTA CORP BALTIMORE MD RESEARCH INST FOR ADVANCED STUDIES

Personal Author(s) : Maycock,J. Norman

Report Date : FEB 1972

Pagination or Media Count : 72

Abstract : The defect disorder of potassium azide has been fully characterized in terms of its thermodynamic parameters. This defect state model has been used to propose a more definative mechanism for its thermal decomposition in terms of cationic migration. For barium azide it has been shown that the mobile charge carrying specie is the N3(-) anion. For the two azides, potassium and barium, the explosive characteristics are in a trend of insensitive to moderately sensitive. It is entirely possible that this trend can be attributed to the difference in mobile charge carrying specie, i.e. the potassium cation to azide anion. This trend in explosivity can also be viewed in terms of the electronic structure of the cation, particularly when lead azide is added to the comparison. In the investigation of a possible relationship between defect-disorder and melting point it is clear that a linear relationship exists between the enthalpy of defect formation and the melting point. (Author)

Descriptors :   (*AZIDES, *CRYSTAL DEFECTS), (*EXPLOSIVES, AZIDES), DECOMPOSITION, PYROLYSIS, ELECTRICAL CONDUCTIVITY, ENTHALPY, THERMOCHEMISTRY, IMPACT TESTS, SHOCK WAVES, DOPING, ELECTRON MICROSCOPY, SURFACES, BARIUM COMPOUNDS, POTASSIUM COMPOUNDS

Subject Categories : Ammunition and Explosives
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE