Materials Modification and Synthesis Under High Pressure Shock Compression

Graham, R. A.; Morosin, B.; Venturini, E.L.; Carr, M. J.

doi:10.1146/annurev.ms.16.080186.001531

Cited by 80 publications

(24 citation statements)

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“…[23][24][25][26][27] Studies of such shock-induced chemical reactions have drawn significant interest in recent years for several reasons: (i) initiating reactions at the high-pressure state may lead to the synthesis of novel phases, not obtainable through conventional ambient-pressure techniques, (ii) the formation of high-pressure phases and their possible reversion upon unloading will result in unique reaction pathways and associated enthalpies, effectively altering the energetics of next-generation materials, and (iii) understanding the reaction initiation behaviour gives potential control of energy release characteristics over a wide range of spatial and temporal scales.…”

Section: Introductionmentioning

confidence: 99%

Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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The shock-compression of reactive powder mixtures can yield varied chemical behaviour with occurrence of mechanochemical reactions in the time-scale of the high-pressure state, or thermochemical reactions in the time-scale of temperature equilibration, or simply the creation of densepacked highly reactive state of material. The principal challenge has been to understand the processes that distinguish between mechanochemical (shock-induced) and thermochemical (shock-assisted) reactions, which has broad implications for the synthesis of novel metastable or non-equilibrium materials, or the design of highly configurable next-generation energetic materials. In this paper, the process of shock-compression in reactive powder mixtures and the associated role of various intrinsic and extrinsic characteristics of reactants in the triggering of ultra-fast "shock-induced" chemical reactions are discussed. Experimental techniques employing time-resolved diagnostics, and results, that identify the occurrence of shock-induced reactions are reviewed. Conceptual and numerical models used to describe the heterogeneous nature of such reactions through mesoscopic details of shock-compression are presented. Finally, a discussion of the application of recent results for the design of reactive material systems with controlled reaction initiation and energy release characteristics is provided.

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Section: Introductionmentioning

confidence: 99%

Shock compression of reactive powder mixtures

Eakins

Thadhani

2009

International Materials Reviews

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“…This initial discovery was followed by activity in Japan [2,3] and the USSR [4][5][6][7][8]. In the U.S., the pioneering work of Graham and co-workers [9][10][11] was followed by investigations by Vreeland and co-workers [12,13], Horie et al [14,15], Boslough [16], Thadhani and co-workers [17,18], and Yu et al [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Shock synthesis of compounds from powders is triggered by the extraordinarily high energy deposition rate at the surfaces of the powders, thereby changing their configuration, forcing them in close contact, activating them by introducing large densities of defects, and heating them close to or even above their melting temperatures [8][9][10][11]. Some fundamental questions regarding these reactions remain unanswered.…”

Section: Introductionmentioning

confidence: 99%

Shock synthesis of silicides—I. experimentation and microstructural evolution

Vecchio

Meyers

1994

Acta Metallurgica et Materialia

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Abstract--Niobium and molybdenum silicides were synthesized by the passage of high-amplitude shock waves through elemental powder mixtures. These shock waves were generated by planar parallel impact of explosively-accelerated flyer plates on momentum-trapped capsules containing the powders. Recovery of the specimens revealed unreacted, partially-reacted, and fully-reacted regions, in accord with shock energy levels experienced by the powder. Electron microscopy was employed to characterize the partiallyand fully-reacted regions for the Mo-Si and Nb-Si systems, and revealed only equilibrium phases. Selected-area and convergent beam electron diffraction combined with X-ray microanalysis verified the crystal structure and compositions of the reacted products. Diffusion couples between Nb and Si were fabricated for the purpose of measuring static diffusion rates and determining the phases produced under non-shock condition. Comparison of these non-shock diffusion results with the shock synthesis results indicates that a new mechanism is responsible for the production of the NbSi2 and MoSi2 phases under shock compression. At the local level the reaction can be rationalized, for example, in the Nb-Si system under shock compression, through the production of a liquid-phase reaction product (NbSi2) at the Nb-particle/Si-liquid interface, the formation of spherical nodules (~2/zm diameter) of this product through interfacial tension, and their subsequent solidification.

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“…For nickel ferrite (NiFe 2 O 4 ), its saturated magnetization (M s ) is 270 G at 20°C [12]. So according to (1), the application of an applied magnetic field of the order of Ͼ2.7 Oe, which approximates to that of a ferromagnet [12], may be sufficient to bring the materials practically to saturation. Hence, it is reasonable that the magnetizations of the furnace-reacted nickel ferrite and the two shock-synthesized powders in Fig.…”

Section: Magnetizationmentioning

confidence: 99%

“…Such high-rate chemical reactions can be advantageously utilized to synthesize materials with novel phases and unique microstructures, or to generate radically modified materials with physically interesting or technologically useful properties [1][2][3]. Many works concerning the synthesis and modification of complex metal oxides by shock waves have been published [4,5], but only a few deal with the modification of nickel ferrites purchased, and these works focus on the properties of the magnetism and microwave absorption of nickel ferrites [6,7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanosized nickel ferrites by shock waves and their magnetic properties

Liu

He²,

Jin³

et al. 2001

Materials Research Bulletin

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The nanosized mixture powders of ferric oxide and nickel oxide prepared by the coprecipitation in a stoichiometric ratio to form NiFe 2 O 4 were subjected to shock wave treatment. The nanosized nickel ferrites with different particle sizes were synthesized by means of varying initial packing density of the mixture. Compared with nickel ferrite prepared by conventional calcination, the magnetization of ones by shock wave treatment increases significantly. It is believed that shock wave treatment is a novel method for the preparation of nanosized powders of composite metal oxides with particular physical properties.

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Materials Modification and Synthesis Under High Pressure Shock Compression

Cited by 80 publications

References 0 publications

Shock compression of reactive powder mixtures

Shock compression of reactive powder mixtures

Shock synthesis of silicides—I. experimentation and microstructural evolution

Synthesis of nanosized nickel ferrites by shock waves and their magnetic properties

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