CC BY
21ISHS 2019 Moscow, Russia
CURRENT STATE AND FUTURE PROSPECTS OF SOLUTION
COMBUSTION SYNTHESIS
Kh. Manukyan
Nuclear Science Laboratory, Department of Physics, University of Notre Dame,
Notre Dame, IN 46556, USA e-mail: kmanukya@nd.edu
DOI: 10.24411/9999-0014A-2019-10096
Solution combustion synthesis (SCS) is a rapid method for energy-efficient preparation of a large variety of materials. The self-generated heat of synthesis provides a localized energy supply that eliminates or reduces the need for externally applied thermal processing. The synthesis of powdered materials by this method involves heating of homogeneous solutions containing metal nitrates and organic compounds. Rapid heating leads to evaporation of solvent and formation of a viscous gel. Further heating initiates a high-temperature self-sustaining reaction in the gels resulting in the formation of nanostructured simple and complex oxides. SCS provides a simple formation of high-quality multi-element compounds with complex crystal structures (perovskites, garnets, spinels, silicates, and phosphates).
This talk focuses on the analysis of new approaches and results in the field of SCS obtained during the last few years. Kinetics and thermodynamics of reactive solutions used in different chemical routes will be considered, and the role of process parameters will be discussed, focusing on the chemical mechanisms that are responsible for rapid self-sustained reactions. New approaches investigating the mechanism and kinetics of these reactions will be discussed. The relationships between processing conditions, structure, and morphology of products will be presented. The basic principles for controlling the composition, morphology, and structure of SCS-derived products, and routes to regulate the morphology and size of the nanoscale powders will also be reviewed.
Recent advances of SCS method in the preparation of actinide nanoscale materials, thin films as well as some complex multicomponent alloys which have high potentials for the use in advanced nuclear technologies or nuclear data measurements will be highlighted. Particular emphasis will be placed on tailoring the SCS to obtain non-oxide and non-metallic compounds with uniform morphology and structure. This presentation will also highlight several applications of SCS products, such as target materials for nuclear cross-section measurements as well as nanoscale magnetic materials. Recent results on examples of irradiation-induced modifications of the structure and properties of nanoscale materials will be presented. Emphasis will be placed on irradiation-induced changes in thin films and layered nanostructures. Some essential relationships linking the irradiation conditions, structural changes, and properties of materials will be outlined. Finally, the prospects of SCS for processing of nanoscale materials and its potential commercialization pathways will be summarized.
Kh.Manukyan
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