Quasi-hydrostatic high-pressure equations of state (EOS) are typically determined, for crystalline solids, by measuring unit-cell volumes using x-ray diffraction (XRD) techniques. However, when characterizing low-symmetry materials with large unit cells, conventional XRD approaches may become problematic. To overcome this issue, we examined the utility of a “direct” approach toward determining high pressure material volume by measuring surface area and sample thickness using optical microscopy and interferometry (OMI), respectively. We have validated this experimental approach by comparing results obtained for 2,4,6-triamino-1,3,5-trinitrobenzene TATB with an EOS determined from synchrotron XRD measurements; and, a good match is observed. We have measured the high pressure EOS of 5-nitro-2,4-dihydro-1,2,4,-triazol-3-one (α-NTO) up to 28 GPa. No high-pressure XRD EOS data have been published on α-NTO, probably due to its complex crystal structure. The results of this study suggest that OMI is a reliable and versatile alternative for determining EOSs, especially when conventional methodologies are impractical.
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7 April 2016
Research Article|
April 07 2016
The equation of state of 5-nitro-2,4-dihydro-1,2,4,-triazol-3-one determined via in-situ optical microscopy and interferometry measurements
Elissaios Stavrou;
Elissaios Stavrou
a)
Lawrence Livermore National Laboratory
, Physical and Life Sciences Directorate, P.O. Box 808, Livermore, California 94550, USA
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Joseph M. Zaug
;
Joseph M. Zaug
b)
Lawrence Livermore National Laboratory
, Physical and Life Sciences Directorate, P.O. Box 808, Livermore, California 94550, USA
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Sorin Bastea;
Sorin Bastea
Lawrence Livermore National Laboratory
, Physical and Life Sciences Directorate, P.O. Box 808, Livermore, California 94550, USA
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Jonathan C. Crowhurst
Jonathan C. Crowhurst
Lawrence Livermore National Laboratory
, Physical and Life Sciences Directorate, P.O. Box 808, Livermore, California 94550, USA
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a)
E-mail: [email protected]
b)
E-mail: [email protected]
J. Appl. Phys. 119, 135904 (2016)
Article history
Received:
December 10 2015
Accepted:
March 23 2016
Citation
Elissaios Stavrou, Joseph M. Zaug, Sorin Bastea, Jonathan C. Crowhurst; The equation of state of 5-nitro-2,4-dihydro-1,2,4,-triazol-3-one determined via in-situ optical microscopy and interferometry measurements. J. Appl. Phys. 7 April 2016; 119 (13): 135904. https://doi.org/10.1063/1.4945426
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