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- W4214690673 abstract "Two-dimensional transition metals borides TixBxhave excellent magnetic and electronic properties and great potential in metal-ion batteries and energy storage. The thermal management is important for the safety and stability in these applications. We investigated the lattice dynamical and thermal transport properties of bulk-TiB2and its two-dimensional (2D) counterparts based on density functional theory combined with solving phonon Boltzmann transport equation. The Poisson's ratio of bulk-TiB2is positive while it changes to negative for monolayer TiB2. We found that dimension reduction can cause the room-temperature in-plane lattice thermal conductivity decrease, which is opposite the trend of MoS2, MoSe2, WSe2and SnSe. Additionally, the room temperature thermal conductivity of mono-TiB2is only one sixth of that for bulk-TiB2. It is attributed to the higher Debye temperature and stronger bonding stiffness in bulk-TiB2. The bulk-TiB2has higher phonon group velocity and weaker anharmonic effect comparing with its 2D counterparts. On the other hand, the room temperature lattice thermal conductivity of mono-Ti2B2is two times higher than that of mono-TiB2, which is due to three-phonon selection rule caused by the horizontal mirror symmetry." @default.
- W4214690673 created "2022-03-02" @default.
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- W4214690673 date "2022-03-17" @default.
- W4214690673 modified "2023-10-13" @default.
- W4214690673 title "Remarkable decrease in lattice thermal conductivity of transition metals borides TiB<sub>2</sub> by dimensional reduction" @default.
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- W4214690673 doi "https://doi.org/10.1088/1361-6528/ac58a6" @default.
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