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84 results on '"Velisavljevic, Nenad"'

61. EQUATION OF STATE OF AMMONIUM NITRATE

Author

Robbins, David L., primary, Sheffield, Stephen A., additional, Dattelbaum, Dana M., additional, Velisavljevic, Nenad, additional, Stahl, David B., additional, Elert, Mark, additional, Furnish, Michael D., additional, Anderson, William W., additional, Proud, William G., additional, and Butler, William T., additional

Published
2009
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64. EQUATION OF STATE FOR TI-BETA-21S

Author

Honnell, Kevin G., primary, Velisavljevic, Nenad, additional, Adams, Chris D., additional, Rigg, Paulo A., additional, Chesnut, Gary N., additional, Aikin, Robert M., additional, Boettger, Jonathan C., additional, Elert, Mark, additional, Furnish, Michael D., additional, Chau, Ricky, additional, Holmes, Neil, additional, and Nguyen, Jeffrey, additional

Published
2008
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65. STATIC HIGH PRESSURE X-RAY DIFFRACTION OF TI-6AL-4V

Author

Chesnut, Gary N., primary, Velisavljevic, Nenad, additional, Sanchez, Lilliana, additional, Elert, Mark, additional, Furnish, Michael D., additional, Chau, Ricky, additional, Holmes, Neil, additional, and Nguyen, Jeffrey, additional

Published
2008
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74. EQUATION OF STATE OF AMMONIUM NITRATE.

Author

Robbins, David L., Sheffield, Stephen A., Dattelbaum, Dana M., Velisavljevic, Nenad, and Stahl, David B.

Subjects
AMMONIUM nitrate, EQUATIONS of state, PROPERTIES of matter, INDUSTRIAL chemistry, PRESSURE
Abstract

Ammonium nitrate (AN) is a widely used fertilizer and mining explosive. AN is commonly used in ammonium nitrate-fuel oil (ANFO), which is a mixture of explosive-grade AN prills and fuel oil in a 94:6 ratio by weight. ANFO is a non-ideal explosive with measured detonation velocities around 4 km/s. The equation of state properties and known initiation behavior of neat AN are limited. We present the results of a series of gas gun-driven plate impact experiments on pressed neat ammonium nitrate at 1.72 g/cm3. No evidence of initiation was observed under shock loading to 22 GPa. High pressure x-ray diffraction experiments in diamond anvil cells provided insight into the high pressure phase behavior over the same pressure range (to 25 GPa), as well as a static isotherm at ambient temperature. From the isotherm and thermodynamic properties at ambient conditions, a preliminary unreacted equation of state (EOS) has been developed based on the Murnaghan isotherm and Helmholtz formalism [1], which compares favorably with the available experimental Hugoniot data on several densities of AN. [ABSTRACT FROM AUTHOR]

Published
2009
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75. STATIC HIGH PRESSURE X-RAY DIFFRACTION OF TI-6AL-4V.

Author

Chesnut, Gary N., Velisavljevic, Nenad, and Sanchez, Lilliana

Subjects
*X-ray diffraction, *DIAMOND anvil cell, *STATIC pressure probes, *MATERIALS at high pressures, *HIGH pressure (Science), *TITANIUM
Abstract

Ti-6Al-4V was examined under static-high pressure conditions using a diamond anvil cell. The angle-dispersive x-ray diffraction experiments were performed at the Advanced Photon Source, Argonne National Laboratory. Radial and axial geometry were used to examine multiple samples. The purpose of the experiment was to generate pressure-volume data at room temperature (which is non-existent in literature) and to examine deviatoric stress effects on such a hard alloy. [ABSTRACT FROM AUTHOR]

Published
2007
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76. EQUATION OF STATE FOR TI-BETA-21S.

Author

Honnell, Kevin G., Velisavljevic, Nenad, Adams, Chris D., Rigg, Paulo A., Chesnut, Gary N., Aikin, Robert M., and Boettger, Jonathan C.

Subjects
*ALLOYS, *FERMIONS, *EQUATIONS, *THERMAL expansion, *HIGH temperatures, *ATMOSPHERIC temperature
Abstract

A new, tabular, SESAME equation of state, along with new diamond-anvil, Hugoniot, and thermal-expansion data, is presented for Ti-Beta-21S (TIMETAL® 21S), a high-strength, high-temperature, beta-stabilized alloy of Ti, Mo, Nb, Al and Si. The new equation of state combines an empirical, Vinet description of the cold curve with the Johnson ionic model and the Thomas-Fermi-Dirac model for the thermal electronic contributions. Two coexisting phases, HCP (α) and BCC (β), are observed at room temperature and pressure, with the α phase disappearing above 67 GPa. Predictions for the room-temperature isotherm, principal Hugoniot, thermal expansion, and heat capacity are compared to new and existing experimental results. [ABSTRACT FROM AUTHOR]

Published
2007
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78. Isotopically pure 13C layer as a stress sensor in a diamond anvil cell.

Author

Wei Qui, Velisavljevic, Nenad, Baker, Paul A., Vohra, Yogesh K., and Weir, Samuel T.

Subjects
*DIAMONDS, *ANVILS, *INDUSTRIAL diamonds, *NANOTUBES, *RAMAN effect, *SENSOR networks
Abstract

Isotopically pure 13C homoepitaxial diamond layer of 20±5 microns thickness was grown on top of a brilliant cut diamond anvil by a microwave plasma chemical vapor deposition process for application as a stress sensor. This isotopically pure diamond tip was then used in conjunction with a natural abundance 12C diamond anvil to generate high pressure on a soft sample containing carbon nanotubes to 100 GPa. The 13C diamond Raman signal remained a distinct single peak showing that the mean normal stress experienced by this thin layer is uniform to the highest pressure. The stress-induced shift of the 13C layer is related to the quasihydrostatic pressure in the sample chamber using a ruby pressure sensor and shows a remarkably linear behavior to extreme pressures. [ABSTRACT FROM AUTHOR]

Published
2004
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84. CO 2 laser heating system for in situ radial x-ray absorption at 16-BM-D at the Advanced Photon Source.

Author

Childs C, Smith D, Smith GA, Ellison P, Sneed D, Hinton J, Siska E, Pigott JS, Rod E, O'Donnell W, Salem R, Sturtevant B, Scharff RJ, Velisavljevic N, Park C, and Salamat A

Abstract

We present a portable CO 2 laser heating system for in situ x-ray absorption spectroscopy (XAS) studies at 16-BM-D (High Pressure Collaborative Access Team, Advanced Photon Source, Argonne National Laboratory). Back scattering optical measurements are made possible by the implementation of a Ge beamsplitter. Optical pyrometry is conducted in the near-infrared, and our temperature measurements are free of chromatic aberration due to the implementation of the peak-scaling method [A. Kavner and W. R. Panero, Phys. Earth Planet. Inter. 143-144, 527-539 (2004) and A. Kavner and C. Nugent, Rev. Sci. Instrum. 79, 024902 (2008)] and mode scrambling of the input signal. Laser power stabilization is established using electronic feedback, providing a steady power over second timescales [Childs et al., Rev. Sci. Instrum. 91, 103003 (2020)]-crucial for longer XAS collections. Examples of in situ high pressure-temperature extended x-ray absorption fine structure measurements of ZrO 2 are presented to demonstrate this new capability.

Published
2022
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