TY - GEN
T1 - The EOS of α-NTO through high-pressure microscopy-interferometry measurements
AU - Stavrou, Elissaios
AU - Zaug, Joseph M.
AU - Bastea, Sorin
AU - Crowhurst, Jonathan C.
AU - Radousky, Harry B.
AU - Armstrong, Michael R.
PY - 2017/1/13
Y1 - 2017/1/13
N2 - Measuring the volume of a material compressed quasi-statically to a high-pressure typically involves the determination of a primitive crystal cell volume using x-ray diffraction (XRD) techniques. The accumulation of pressure dependent volumes leads to an understanding of the material's equation of state, (EOS); however, in the case of low-symmetry (e.g. triclinic) materials with twining features, and large primitive cells, conventional XRD approaches can be technically problematic and lead to ambiguous or mathematically under-determined lattice constants. To resolve this long-standing issue, we examined the utility of a "direct" approach toward determining a material's volume by measuring surface area and sample height using optical microscopy and interferometry respectively. To test the validity of our proposed approach, we first compared our results from pressurized Triamino-Trinitrobenzene (TATB, SG P-1) with a published EOS determined by synchrotron XRD measurements of Stevens et al. A near-perfect match between the two sets of V(P, 300K) data is observed; and thus, we proceeded to determine the EOS of the energetic material 5-nitro-2,4-dihydro-1,2,4,-triazol-3-one (α-NTO), which under ambient conditions crystallizes as a fourcomponent twinned system with a triclinic symmetry (SG P-1). No high-pressure XRD EOS data have been published on α-NTO, probably due to its unambiguously complex crystal structure. The results of this study reveal that our proposed approach applied to quasi-statically compressed anisotropic materials is a reliable alternative toward determining material EOSs,-especially when conventional methodologies are not feasible.
AB - Measuring the volume of a material compressed quasi-statically to a high-pressure typically involves the determination of a primitive crystal cell volume using x-ray diffraction (XRD) techniques. The accumulation of pressure dependent volumes leads to an understanding of the material's equation of state, (EOS); however, in the case of low-symmetry (e.g. triclinic) materials with twining features, and large primitive cells, conventional XRD approaches can be technically problematic and lead to ambiguous or mathematically under-determined lattice constants. To resolve this long-standing issue, we examined the utility of a "direct" approach toward determining a material's volume by measuring surface area and sample height using optical microscopy and interferometry respectively. To test the validity of our proposed approach, we first compared our results from pressurized Triamino-Trinitrobenzene (TATB, SG P-1) with a published EOS determined by synchrotron XRD measurements of Stevens et al. A near-perfect match between the two sets of V(P, 300K) data is observed; and thus, we proceeded to determine the EOS of the energetic material 5-nitro-2,4-dihydro-1,2,4,-triazol-3-one (α-NTO), which under ambient conditions crystallizes as a fourcomponent twinned system with a triclinic symmetry (SG P-1). No high-pressure XRD EOS data have been published on α-NTO, probably due to its unambiguously complex crystal structure. The results of this study reveal that our proposed approach applied to quasi-statically compressed anisotropic materials is a reliable alternative toward determining material EOSs,-especially when conventional methodologies are not feasible.
UR - http://www.scopus.com/inward/record.url?scp=85016969464&partnerID=8YFLogxK
U2 - 10.1063/1.4971543
DO - 10.1063/1.4971543
M3 - 会议稿件
AN - SCOPUS:85016969464
T3 - AIP Conference Proceedings
BT - Shock Compression of Condensed Matter - 2015
A2 - Ravelo, Ramon
A2 - Sewell, Thomas
A2 - Chau, Ricky
A2 - Germann, Timothy
A2 - Oleynik, Ivan I.
A2 - Peiris, Suhithi
PB - American Institute of Physics Inc.
T2 - 19th Biennial American Physical Society Conference on Shock Compression of Condensed Matter, SCCM 2015
Y2 - 14 June 2015 through 19 June 2015
ER -