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Synthesis of Novel MAX Phase Ti3ZnC2 via A-site-element-substitution Approach
Chinese Acad Sci, Peoples R China.
Chinese Acad Sci, Peoples R China.
Chinese Acad Sci, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, Faculty of Science & Engineering.
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2019 (English)In: Journal of Inorganic Materials, ISSN 1000-324X, Vol. 34, no 1, p. 60-64Article in journal (Refereed) Published
Abstract [en]

Using Ti3AlC2 as the precursor, a new MAX phase Ti3ZnC2 was synthesized via an A-elemental substitution reaction in a molten salts bath. Composition and crystal structure of Ti3ZnC2 were confirmed by XRD, SEM and TEM analysis. Its structure stability and lattice parameter of Ti3ZnC2 were further proved by a theoretical calculation based on density function theory (DFT). Moreover, thermodynamics of A-elemental substitution reactions based on Fe, Co, Ni, and Cu were investigated. All results indicated that the similar substitution reactions are feasible to form series of MAX phases whose A sites are Fe, Co, Ni, and Cu elements. The substitution reaction was achieved by diffusion of Zn atoms into A-layers of Ti3AlC2, which requires Al-Zn eutectic formation at high temperatures. The molten salts provided a moderate environment for substitution reaction and accelerated reaction dynamics. The major advantage of this substitution reaction is that MAX phase keeps individual metal carbide layers intact, thus the formation of competitive phases, such as MA alloys, was avoided. The proposed A-elemental substitution reactions approach opens a new door to design and synthesize novel MAX phases which could not be synthesized by the traditional methods.

Place, publisher, year, edition, pages
SCIENCE PRESS , 2019. Vol. 34, no 1, p. 60-64
Keywords [en]
MAX phase; elemental exchange reaction; Ti3ZnC2
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-156215DOI: 10.15541/jim20180377ISI: 000461855200006OAI: oai:DiVA.org:liu-156215DiVA, id: diva2:1303216
Note

Funding Agencies|National Natural Science Foundation of China [91426304, 51502310]

Available from: 2019-04-09 Created: 2019-04-09 Last updated: 2019-04-09

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