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Zhang H, Liu SY, Liu S, Li DJ, Liu Y, Wang S. First-principles study of thermodynamic stability and mechanical properties of fifteen high-entropy quaternary metal disilicides. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2023; 36:135403. [PMID: 38096581 DOI: 10.1088/1361-648x/ad15c6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/05/2023] [Accepted: 12/14/2023] [Indexed: 12/28/2023]
Abstract
By combining first-principles density-functional calculations and thermodynamics, we investigated the thermodynamic stability and mechanical properties of 15 quaternary high-entropy metal disilicides composed of silicon and four of the six refractory transition metals Ti, Zr, Hf, V, Nb, and Ta. We constructed a three-dimensional diagram specified by two thermodynamic parameters (the mixing enthalpy and the ratio of the entropy term in the Gibbs free energy to enthalpy) and a structural parameter (the lattice size difference). The obtained diagram allows us to predict that, except for TiZrHfVSi8, the formation of all other fourteen single-phase metal disilicides is thermodynamically favorable. Our calculations show that, for the formation of each of the 14 metal disilicides, the driving force suppresses the resistance at temperatures well below the melting point, suggesting that it is feasible to synthesize these high-entropy materials. One of these (TiHfNbTaSi8) has already been experimentally realized. Furthermore, the values of the mechanical parameters and melting points of the predicted fourteen quaternary high-entropy metal disilicides are all greater than the corresponding average values of the four single-metal disilicides.
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Affiliation(s)
- Huilun Zhang
- College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, People's Republic of China
| | - Shi-Yu Liu
- College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, People's Republic of China
| | - Shiyang Liu
- Institute of Information Optics, Zhejiang Normal University, Jinhua, Zhejiang 321004, People's Republic of China
| | - De-Jun Li
- College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, People's Republic of China
| | - Yanyu Liu
- College of Physics and Materials Science, Tianjin Normal University, Tianjin 300387, People's Republic of China
| | - Sanwu Wang
- Department of Physics and Engineering Physics, The University of Tulsa, Tulsa, OK 74104, United States of America
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Liu SY, Zhang S, Liu S, Li DJ, Niu Z, Li Y, Wang S. Stability and mechanical properties of single-phase quinary high-entropy metal carbides: First-principles theory and thermodynamics. Ann Ital Chir 2022. [DOI: 10.1016/j.jeurceramsoc.2022.02.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Phase stability, mechanical properties and melting points of high-entropy quaternary metal carbides from first-principles. Ann Ital Chir 2021. [DOI: 10.1016/j.jeurceramsoc.2021.05.022] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ali MA, Naqib SH. Recently synthesized (Ti 1-x Mo x ) 2AlC (0 ≤ x ≤ 0.20) solid solutions: deciphering the structural, electronic, mechanical and thermodynamic properties via ab initio simulations. RSC Adv 2020; 10:31535-31546. [PMID: 35520673 PMCID: PMC9056384 DOI: 10.1039/d0ra06435a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 08/18/2020] [Indexed: 11/21/2022] Open
Abstract
The structural, electronic, mechanical and thermodynamic properties of (Ti1−xMox)2AlC (0 ≤ x ≤ 0.20) were explored using density functional theory. The obtained lattice constants agree well with the experimental values. The electronic band structure confirms the metallic nature. Strengthening of covalent bonds due to Mo substitution is confirmed from the study of band structure, electronic density of states and charge density mapping. The elastic constants satisfy the mechanical stability criteria. Strengthening of covalent bonds leads to enhanced mechanical properties. (Ti1−xMox)2AlC compounds are found to exhibit brittle behavior. The anisotropic nature of (Ti1−xMox)2AlC is revealed from the direction dependent Young's modulus, compressibility, shear modulus and Poisson's ratio as well as the shear anisotropic constants and the universal anisotropic factor. The Debye temperature, minimum thermal conductivity, Grüneisen parameter and melting temperature of (Ti1−xMox)2AlC have been calculated for different Mo contents. Our calculated values are compared with reported values, where available. The structural, electronic, mechanical and thermodynamic properties of (Ti1−xMox)2AlC (0 ≤ x ≤ 0.20) were explored using density functional theory.![]()
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Affiliation(s)
- M A Ali
- Department of Physics, Chittagong University of Engineering and Technology (CUET) Chattogram 4349 Bangladesh
| | - S H Naqib
- Department of Physics, University of Rajshahi Rajshahi-6205 Bangladesh
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Pramanick A, Dmowski W, Egami T, Budisuharto AS, Weyland F, Novak N, Christianson AD, Borreguero JM, Abernathy DL, Jørgensen MRV. Stabilization of Polar Nanoregions in Pb-free Ferroelectrics. PHYSICAL REVIEW LETTERS 2018; 120:207603. [PMID: 29864364 DOI: 10.1103/physrevlett.120.207603] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Revised: 02/07/2018] [Indexed: 06/08/2023]
Abstract
The formation of polar nanoregions through solid-solution additions is known to enhance significantly the functional properties of ferroelectric materials. Despite considerable progress in characterizing the microscopic behavior of polar nanoregions (PNR), understanding their real-space atomic structure and dynamics of their formation remains a considerable challenge. Here, using the method of dynamic pair distribution function, we provide direct insights into the role of solid-solution additions towards the stabilization of polar nanoregions in the Pb-free ferroelectric of Ba(Zr,Ti)O_{3}. It is shown that for an optimum level of substitution of Ti by larger Zr ions, the dynamics of atomic displacements for ferroelectric polarization are slowed sufficiently below THz frequencies, which leads to increased local correlation among dipoles within PNRs. The dynamic pair distribution function technique demonstrates a unique capability to obtain insights into locally correlated atomic dynamics in disordered materials, including new Pb-free ferroelectrics, which is necessary to understand and control their functional properties.
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Affiliation(s)
- A Pramanick
- Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong SAR
| | - W Dmowski
- Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Oak Ridge, Tennessee 37831, USA
| | - T Egami
- Shull Wollan Center, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
- Department of Materials Science and Engineering, University of Tennessee, Oak Ridge, Tennessee 37831, USA
| | - A Setiadi Budisuharto
- Department of Materials Science and Engineering, City University of Hong Kong, Kowloon Tong, Hong Kong SAR
| | - F Weyland
- Institute of Materials Science, Technische Universität Darmstadt, Darmstadt 64287, Germany
| | - N Novak
- Institute of Materials Science, Technische Universität Darmstadt, Darmstadt 64287, Germany
| | - A D Christianson
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - J M Borreguero
- Neutron Data Analysis and Visualization Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - D L Abernathy
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
| | - M R V Jørgensen
- Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, 8000 Aarhus C, Denmark
- MAX IV Laboratory, Lund University, SE-221 00 Lund, Sweden
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