Synthesis of novel Zr-rich 312-type solid-solution MAX phase in the Zr-Ti-Si-C system |
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| Affiliation: | 1. Federal Research Centre “Komi Science Centre of the Ural Branch of the Russian Academy of Sciences”, 24 Kommunisticheskaya ul., Syktyvkar, Komi Republic 167982, Russian Federation;2. NRC Kurchatov Institute, Kurchatov Square, 1, Moscow 123182, Russian Federation;1. Department of Physics, Rajshahi University, Rajshahi 6205, Bangladesh;2. School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, QLD 4000, Australia;3. Faculty of Engineering, Environment and Computing, Coventry University, Priory Street, Coventry CV1 5FB, UK;4. Department of Materials, Imperial College, London SW7 2AZ, UK;5. International Islamic University Chittagong, 154/A College Road, Chittagong 4203, Bangladesh;6. Department of Physics, V. Karazin Kharkiv National University, Svobody Sq.4, Kharkiv 61077, Ukraine;1. Center of Materials Science and Engineering, School of Mechanical and Electronic Control Engineering, Beijing Jiaotong University, Beijing, 100044, China;2. China Porcelain Fuchi (Suzhou) High Tech Nano Materials Co. Ltd, Suzhou, China;1. State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures, School of Physical Science and Technology, Guangxi University, Nanning 530004, PR China;2. The School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou 730070, PR China;3. School of Material Science and Engineering, Central South University, Changsha, Hunan 410083, PR China |
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| Abstract: | A novel 312-type MAX-phase solid solution series in the Zr-Ti-Si-C system has been synthesized by the vacuum carbosilicothermic reduction method using mixtures of TiO2, ZrO2, SiC, and Si powders as starting materials. The upper limit for Zr content in metal sublattice of the synthesized (Zr,Ti)3SiC2 MAX phase solid solutions was found to be as much as approximately 66 at%, closely corresponding to a hypothetical quaternary Zr2TiSiC2 MAX phase. A wide miscibility gap inside the interval of Zr content in metal sublattice ranging between 22 at% and 55 at% was found. Crystal structure of the synthesized MAX-phase solid solutions was studied by HR-STEM/HAADF and XRD Rietveld analyses. The lattice constants were determined to be linearly correlated with Zr content as predicted by Vegard's law. A significant inhomogeneity in distribution of metal atoms similar to that of out-of-plane ordered quaternary MAX phases has been established for both Ti-rich and Zr-rich MAX-phase solid solutions. |
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| Keywords: | MAX phase Solid solution Out-of-plane ordering Carbosilicothermic reduction |
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