• Materials synthesis and phase transitions under shock waves

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      https://www.ias.ac.in/article/fulltext/boms/022/03/0295-0300

    • Keywords

       

      Shock waves; phase transitions; materials synthesis; superhard materials

    • Abstract

       

      Shock wave compression of materials is accompanied by high pressure, high-strain-rate loading, elevated temperatures, large shear stresses and excessive plastic deformation. All these features create an unusual state in materials that is not possible in any processing method. Thus, in multi-component system of powders, these can lead to enhanced reactivity because of defect promoted diffusional flow of the reactants in a solid-solid chemical reaction for materials synthesis. On the other hand, in a one component system, these shock compression features may significantly influence the onset pressure, the kinetics, the mechanism and the reversibility of a phase transformation. We shall illustrate these using examples on the synthesis ofβ-C3N4 and our work on the crystal to amorphous phase transitions inq-GeO2 andα-FePO4.

    • Author Affiliations

       

      Satish C Gupta1

      1. Condensed Matter Physics Division, Bhabha Atomic Research Centre, Mumbai - 400 085, India
    • Dates

       
  • Bulletin of Materials Science | News

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