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Title: The high pressure structure and equation of state of 2,6-diamino-3,5-dinitropyrazine-1-oxide (LLM-105) up to 20 GPa: X-ray diffraction measurements and first principles molecular dynamics simulations

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4932683· OSTI ID:1251076
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Hacettepe Univ., Ankara (Turkey)

Recent theoretical studies of 2,6-diamino-3,5-dinitropyrazine-1-oxide (C 4 H 4 N 6 O 5 Lawrence Livermore Molecule No. 105, LLM-105) report unreacted high pressure equations of state that include several structural phase transitions, between 8 and 50 GPa, while one published experimental study reports equation of state (EOS) data up to a pressure of 6 GPa with no observed transition. Here we report the results of a synchrotron-based X-ray diffraction study and also ambient temperature isobaric-isothermal atomistic molecular dynamics simulations of LLM-105 up to 20 GPa. We find that the ambient pressure phase remains stable up to 20 GPa; there is no indication of a pressure induced phase transition. We do find a prominent decrease in b-axis compressibility starting at approximately 13 GPa and attribute the stiffening to a critical length where inter-sheet distance becomes similar to the intermolecular distance within individual sheets. The ambient temperature isothermal equation of state was determined through refinements of measured X-ray diffraction patterns. The pressure-volume data were fit using various EOS models to yield bulk moduli with corresponding pressure derivatives. We find very good agreement between the experimental and theoretically derive d EOS.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-07NA27344; 114C120; AC02-05CH11231
OSTI ID:
1251076
Alternate ID(s):
OSTI ID: 1421222; OSTI ID: 1440912
Report Number(s):
LLNL-JRNL-670642; JCPSA6
Journal Information:
Journal of Chemical Physics, Vol. 143, Issue 14; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 36 works
Citation information provided by
Web of Science

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Effects of boron doping on structural, electronic, elastic, and optical properties of energetic crystal 2,6-diamino-3,5-dinitropyrazine-1-oxide: a theoretical study using the first principles calculation and Hirshfeld surface analysis journal February 2020
Structural transitions of ordered kesterite-type Cu 2 ZnSnS 4 under pressure journal January 2017
Effects of pressure on the structure and lattice dynamics of ammonium perchlorate: A combined experimental and theoretical study journal July 2018
Pressure-induced phase transition in 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) journal May 2019
High-pressure isothermal equation of state of composite materials: A case study of LX-17 polymer bonded explosive journal July 2019
Initial Mechanisms for the Unimolecular Thermal Decomposition of 2,6-Diamino-3,5-dinitropyrazine-1-oxide journal December 2018
Packing Rearrangements in 4-Hydroxycyanobenzene Under Pressure journal May 2019
Structural transitions of ordered kesterite-type Cu$_{2}$ZnSnS$_{4}$ under pressure text January 2017