Accession Number : ADA267692


Title :   Investigation of the Origin of Hot Spots in Deformed Crystals: Final Report on Ammonium Perchlorate Studies


Descriptive Note : Rept. for Jan 1986-Sep 1990


Corporate Author : NAVAL SURFACE WARFARE CENTER DAHLGREN DIV VA


Personal Author(s) : Elban, W L ; Sandusky, H W ; Beard, B C ; Glancy, B C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267692.pdf


Report Date : 19 Jul 1993


Pagination or Media Count : 39


Abstract : A number of single crystals of ammonium perchlorate (A-P) were shock loaded near the reaction threshold to investigate the effects of concentrated lattice defects (dislocations) and differing crystal orientations on chemical reactivity. Large, optical quality crystals of pure AP were immersed in mineral oil and shocked through either the (001) or 210 surfaces by a detonator. Prior to shock loading, some crystals had localized regions of increased lattice defects and strain created by placing diamond pyramid (Vickers) hardness impressions into their exterior cleavage surfaces. High-speed photographs showed preferential cracking and luminosity near some of the hardness impressions. The photographs also revealed the occurrence of the same slip deformation identified previously from hardness testing. The shocked crystals were recovered, sometimes intact, for microstructural characterization and chemical analyses. Crystal orientation relative to the shock propagation direction changed the dynamic response and threshold for decomposition of the crystal, indicating the influence of material microstructure. Along these freshly cleaved surfaces, the XPS results showed enhanced lattice disruption and perchlorate decomposition as a result of the hardness impressions. The greatest decomposition was not immediately adjacent to the impressions, but near the tips of cracks and along slip planes emanating from the impressions several millimeters, or more, into the crystal.... Ammonium perchlorate, X-ray Photoelectron spectroscopy, Hot spot, Dislocation density, Microhardness, Shock reactivity.


Descriptors :   *LUMINOSITY , *DEFORMATION , *CRYSTALS , *AMMONIUM PERCHLORATE , *HARDNESS , *HOT SPOTS , PROPAGATION , DENSITY , OPTICAL PROPERTIES , MICROSTRUCTURE , DYNAMIC RESPONSE , REACTIVITIES , SINGLE CRYSTALS , CHEMICAL REACTIONS , SHOCK , RESPONSE , X RAY PHOTOELECTRON SPECTROSCOPY , DISLOCATIONS , QUALITY , SURFACES , REGIONS , STRAIN(MECHANICS) , PERCHLORATES , MICROHARDNESS , DETONATORS , DEFECT ANALYSIS , PHOTOELECTRONS , CLEAVAGE , PHOTOGRAPHS , MINERALS , DECOMPOSITION , MINERAL OILS , PYRAMIDS , NUMBERS , OILS , DIAMONDS , CRACKS , SPECTROSCOPY , CHEMICALS , MATERIALS , CRYSTAL LATTICES , LOADS(FORCES)


Subject Categories : Inorganic Chemistry
      Crystallography
      Mechanics
      Thermodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE