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Density of RDX Crystals Grown During High Acceleration in an Ultracentrifuge

Published online by Cambridge University Press:  26 February 2011

Mary Y. D. Lanzerotti ,
Richard Z. Squillace ,
Alexander Gandzelko  and
Jagadish Sharma
Mary Y. D. Lanzerotti
Affiliation:
ylanzero@pica.army.mil, U. S. Army ARDEC, Bldg. 3022, Picatinny Arsenal, New Jersey, 07806-5000, United States
Richard Z. Squillace
Affiliation:
rsquill@pica.army.mil, U. S. Army ARDEC, United States
Alexander Gandzelko
Affiliation:
agandz@pica.army.mil, U. S. Army ARDEC
Jagadish Sharma
Affiliation:
sharmaj@nswccd.navy.mil, Naval Surface Warfare Center, Carderock Division, United States
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Abstract

RDX (cyclotrimethylene-trinitramine) crystals were grown during high acceleration (high g) in an ultracentrifuge. These crystals are found to have a density ∼0.6% greater than 1 g crystals and to have a greatly reduced defect content. The high g crystals should therefore have significantly reduced shock sensitivity as compared to commercial grade RDX. When a RDX saturated acetone solution is accelerated at 200,000 g, the RDX solute molecules move individually through the acetone solvent molecules to form a RDX crystal because the density of the RDX (Theoretical Maximum Density 1.806 g/cc) solute is more dense than the acetone (0.79 g/cc)solvent. Crystal growth is controlled by the g-force. Crystal defects including voids and solution inclusions caused by temperature variation or evaporation at 1 g are minimized and the RDX crystal density increases. A nitrogen pycnometer was used to measure the density of the RDX crystals grown at 1 g and at 200,000 g. The density of the RDX crystals grown at 200,000 g (1.7980±0.0003 g/cc) is found to be greater than the density of RDX crystals grown at 1 g (1.7881±0.0003 g/cc) by 0.0099 g/cc. The density of the high g crystal is 99.6% of the Theoretical Maximum Density of RDX.

Keywords

crystal growthcrystaldefects
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 896: Symposium H – Multifunctional Energetic Materials , 2005 , 0896-H05-01
Copyright
Copyright © Materials Research Society 2006

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