Accession Number : ADA141271

Title :   The Influence of Lattice Imperfections on the Chemical Reactivity of Solids. The Growth, Perfection and Defect Properties of PETN (Pentaerythritol Tetranitrate) and RDX (Cyclotrimethylene Trinitramine) Single Crystals. Part 1.

Descriptive Note : Final technical rept.,


Personal Author(s) : Sherwood,J N ; Halfpenny,P J ; Roberts,K J

PDF Url : ADA141271

Report Date : Feb 1984

Pagination or Media Count : 74

Abstract : This report presents an assessment of the growth and perfection of single crystals of the secondary explosive materials PETN and rdx. An account is also given of some preliminary studies of their mechanical behaviour. Details are presented for the preparation of large single crystals of PETN and RDX of extremely high perfection. Using the techniques of X-ray diffraction topography coupled where possible with theoretical calculations, an analysis is made of the dominant growth defect structure of these materials. In both cases the principal defects are dislocations. There is also evidence of growth twinning in PETN. The character (line direction and Burgers vector) of the dislocations are defined. Burgers vectors up to and including lattice translations of 111 (PETN) and 110 (RDX) were identified. Initial attempts have been made to examine the mechanical properties of PETN and RDX using microhardness indentation, etching techniques and X-ray topography. The results are used to make an appraisal of the likely dominant mechanical deformation processes.

Descriptors :   *Crystal defects, *Crystal lattices, *Single crystals, *PETN, *RDX, *HMX, Chemical reactions, Reactivities, Energetic properties, Detonations, Crystal growth, Dislocations, Mechanical properties, Twinning(Crystallography), Polymorphism, Deformation, X ray diffraction, Topography, Etching, Deformation

Subject Categories : Ammunition and Explosives

Distribution Statement : APPROVED FOR PUBLIC RELEASE