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Reaction kinetic studies of metal-doped magnesium silicides

  • Mechanochemical Synthesis
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Abstract

Metal-doped magnesium silicides are promising thermoelectric materials for waste heat recovery application at 500–800 K because of their low density, large natural availability, non-toxicity, good thermal stability, and transport properties. Reaction kinetics of metal-doped magnesium silicides, Mg2SiX m (X = Ti, Nb, Mn, and Co; m = 0.02, 0.04, and 0.08 mol) were investigated in this study. A simple and rapid synthesis of Mg2SiX m samples was carried out using pelletizing, and sintering method at 773–823 K for 300 s. The effect of metal doping on the lattice constants of Mg2SiX m samples was examined using X-ray diffraction technique. Differential thermal analysis heat flow experiments were conducted on (2Mg + Si + mX) sample mixtures to study the solid-state reaction kinetics of Mg2SiX m alloys formation at different scan rates of 0.08, 0.16, 0.25, 0.33 Ks−1. Activation energies for the formation reaction of Mg2Si were determined using Ozawa, and Kissinger–Akahira–Sunrose equations. A 3-D diffusion-controlled reaction mechanism was proposed based on Coats–Redfern (CR) model. The effect of concentration of the metal-dopants on the formation activation energies of Mg2SiX m was investigated using the CR equation plots.

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Acknowledgements

The authors are thankful to the National Science Foundation (NSF) agency for the financial support from the Grant No. DMR-1310072, American Cast Iron Pipe Company (ACIPCO), and Department of Metallurgical and Materials Engineering (MTE) at the University of Alabama for providing the central analytical facilities to complete the present research work.

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  1. Mallikharjuna R. Bogala

    Present address: Department of Mechanical Engineering, The University of South Carolina, Columbia, SC, 24208, USA

Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL, 35487, USA

    Mallikharjuna R. Bogala & Ramana G. Reddy

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  1. Mallikharjuna R. Bogala
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  2. Ramana G. Reddy
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Correspondence to Ramana G. Reddy.

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Bogala, M.R., Reddy, R.G. Reaction kinetic studies of metal-doped magnesium silicides. J Mater Sci 52, 11962–11976 (2017). https://doi.org/10.1007/s10853-017-1095-5

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