Solid-State Synthesis of ZnTe in Shock Waves

Gur'ev, D. L.; Gordopolov, Yu. A.; Бацанов, С. С.

doi:10.1007/s10573-006-0014-x

Cited by 8 publications

(6 citation statements)

References 11 publications

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“…The impacting face of the plunger can use different geometries ranging from a flat face the width of the sample, producing pure compressive strains, to a mixture of shear and compression with a radii-shape plunger to nearly pure shear with a narrow plunger. This experiment is fundamentally different from planar shock experiments performed in previous research ,,− in key aspects. First, the impact in this setup produces compressive and shear strain in the material, whereas planar shock experiments are controlled so that a planar shock passes through the sample.…”

Section: Experimental Methodsmentioning

confidence: 59%

Thermal and Impact Reaction Initiation in Ni/Al Heterogeneous Reactive Systems

2010

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Reaction initiation in the Ni-Al heterogeneous gasless system due to thermal and mechanical stimuli was investigated. Reactive systems with different microstructures, including micro-and nanoscaled powder mixtures, as well as composite particles formed during short-term (15 min) high-energy ball milling (HEBM) of Al/Ni clad particles were examined. Thermal and mechanical responses were tested by differential thermal analysis and shear impact testing, respectively. It was shown that nanomixtures and HEBM samples thermally selfignited at temperatures (T ig ) well below eutectics for Ni-Al (T eut ) 913 K), while the ignition temperature for conventional microscale mixtures is at least T eut . Moreover, T ig for HEBM samples is typically lower than that for nanomixtures. For the HEBM system, the apparent activation energy (E HEBM ) 28 ( 2 kcal/mol) appeared to be half of the nanosystem's measured value (E nano ) 55 ( 5 kcal/mol). Oppositely, it was shown that nanomixtures were mechanically ignitable through shear impacts of the investigated energy range, while HEBM samples were not. Thus, the HEBM samples were comparatively more sensitive to thermal initiation, while the nanomixtures were more sensitive to mechanical initiation. It is believed that the different microstructures contribute to this phenomenon; HEBM material has larger interfacial areas between active materials, which reduces its activation energy and increases thermal sensitivity. The nanomaterials consist of small, hard particles which allow for increased contact stresses during impact and increasing mechanical sensitivity.

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Section: Experimental Methodsmentioning

confidence: 59%

Thermal and Impact Reaction Initiation in Ni/Al Heterogeneous Reactive Systems

2010

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“…As the sample diameter in our experiments was three times that in the experiments performed in [8,11], we should have been more likely to observe detonation in these tests (i.e., the likelihood that the sample diameter was greater than the hypothetical critical diameter required for detonation of the mixture was greater in our tests). Since we did not observe a detonation, our results provide no evidence for the new type of the fast reaction or the transport mechanism proposed in [11].…”

Section: Discussionmentioning

confidence: 72%

“…However, Gur'ev et al [8] believe that shock acceleration should eventually be observed in the Mn + S system, while Batsanov and Gordopolov [9] believe that Mn + S may not be a good candidate for gasless detonation. Indeed, Batsanov and Gordopolov [9] suggest that MnS experiences an irreversible phase transition at high pressures, which prevents the product density from being lower than that of the starting mixture.…”

Section: Introductionmentioning

confidence: 99%

“…Though the focus of this paper is on sulfur-based compositions, similar attempts to observe gasless detonation have been performed in other gasless or low-gas production compositions such as Zn + Te [8] and aluminum + Teflon [13,14]. While some of these experimental investigations have reported what appears to be a steady or amplifying shock wave due to chemical energy release from these compositions, the existence of a self-sustained wave propagating at supersonic speeds for a large number of effective charge diameters has not been definitively established.…”

Section: Introductionmentioning

confidence: 99%

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Experimental investigation of gasless detonation in metal-sulfur compositions

Jetté

Goroshin

Higgins

et al. 2009

Combust Explos Shock Waves

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Samples of zinc-sulfur and manganese-sulfur mixtures are shocked using an explosive pentolite charge to investigate if a shock-initiated reaction is able to support continued shock wave propagation. Samples of two different nominal densities (62 and 86% of theoretical maximum density) are prepared as weakly confined cylinders 50 mm in diameter and are instrumented along their length ( 280 mm) with sensitive piezoelectric pins. Experimental results showed that the shock wave transmitted into the sample by the explosive rapidly decays to an acoustic wave in all four sample types. Furthermore, in denser samples, the part of the sample farthest from the explosive is recovered intact and unreacted, which clearly indicates that the wave is unable to trigger reactions after 100 mm of travel along the sample. Thus, it is concluded that insufficient reaction energy is transmitted forward to the shock wave to prevent its decay as it travels along the sample.

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“…12,23 Inference of shock-induced reaction initiation based on shock velocity increases associated with compound formation in binary powder mixtures, has also been reported in our prior work, 10,11 as well as more recently by Gur'ev and co-workers. 13,14 The degree of reaction and product phases formed due to shock-induced reactions cannot be determined directly through the instrumented experiments performed in this work. Based upon the apparent increase in shock velocity however, an initial attempt was made to construct a reactioncomposition surface, corresponding to the concentrations and extent of possible product phases.…”

Section: Resultsmentioning

confidence: 99%

Shock-induced reaction in a flake nickel + spherical aluminum powder mixture

Eakins

Thadhani

2006

Journal of Applied Physics

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Mixtures of flake-shaped nickel and spherical aluminum powders have been subjected to shock-loading up to 6 GPa to investigate the occurrence of shock-induced chemical reactions. The high-pressure Hugoniot state is determined through time-resolved measurements of the input stress and shock transit time through the specimen. An increase in shock velocity is observed above stress levels of 3.5 GPa, suggesting the initiation of an ultrafast shock-induced chemical reaction and formation of Ni-Al compound͑s͒ occurring in the time scale of the high-pressure shock state.

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Solid-State Synthesis of ZnTe in Shock Waves

Cited by 8 publications

References 11 publications

Thermal and Impact Reaction Initiation in Ni/Al Heterogeneous Reactive Systems

Thermal and Impact Reaction Initiation in Ni/Al Heterogeneous Reactive Systems

Experimental investigation of gasless detonation in metal-sulfur compositions

Shock-induced reaction in a flake nickel + spherical aluminum powder mixture

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