Azat Abdullaev, Kairolla Sekerbayev, Alexander Azarov, Vishnukanthan Venkatachalapathy, Vinay S. Chauhan, Zhandos Utegulov, Andrej Kuznetsov
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引用次数: 0
摘要
最近发现的双γ/β(γ/β)多晶Ga2O3结构是一类新型材料,与传统的异质结构相比,它提供了一种在不改变材料化学成分的情况下调节跨界面功能特性的选择。在这项研究中,我们首次研究了这类同界面结构中的热传输,作为其物理性质的一个实例。特别是,我们采用基于飞秒激光的时域热反射法测量了跨面热导率(k),其调制速率为 MHz,从而有效地获得了整个 γ-/β-Ga2O3 结构的热导率深度剖面图。这样,γ-Ga2O3 的热导率从 1.84 W m-1 K-1 到 2.11 W m-1 K-1 不等,这与γ-相的立方尖晶石结构相符,也与分子动力学模拟数据一致。反过来,单斜β-Ga2O3 的热导率表现出明显的各向异性,其值从 [-201] 取向的 10 W m-1 K-1 到 [010] 取向的 20 Wm-1 K-1。因此,对于在[010] β基底上形成的双γ-/β-Ga2O3多晶体结构,在γ/β界面上的热导率存在数量级的差异,这有可能在热能转换应用中得到利用。
Thermal conductivity of double polymorph Ga2O3 structures
Recently discovered double gamma/beta (γ/β) polymorph Ga2O3 structures constitute a class of novel materials providing an option to modulate functional properties across interfaces without changing the chemical compositions of materials, in contrast to that in conventional heterostructures. In this work, for the first time, we investigate thermal transport in such homo-interface structures as an example of their physical properties. In particular, the cross-plane thermal conductivity (k) was measured by femtosecond laser-based time-domain thermoreflectance with MHz modulation rates, effectively obtaining depth profiles of the thermal conductivity across the γ-/β-Ga2O3 structures. In this way, the thermal conductivity of γ-Ga2O3 ranging from 1.84 to 2.11 W m−1 K−1 was found to be independent of the initial β-substrates orientations, in accordance with the cubic spinel structure of the γ-phase and consistently with the molecular dynamics simulation data. In turn, the thermal conductivity of monoclinic β-Ga2O3 showed a distinct anisotropy, with values ranging from 10 W m−1 K−1 for [−201] to 20 Wm−1 K−1 for [010] orientations. Thus, for double γ-/β-Ga2O3 polymorph structures formed on [010] β-substrates, there is an order of magnitude difference in thermal conductivity across the γ/β interface, which can potentially be exploited in thermal energy conversion applications.
期刊介绍:
APL Materials features original, experimental research on significant topical issues within the field of materials science. In order to highlight research at the forefront of materials science, emphasis is given to the quality and timeliness of the work. The journal considers theory or calculation when the work is particularly timely and relevant to applications.
In addition to regular articles, the journal also publishes Special Topics, which report on cutting-edge areas in materials science, such as Perovskite Solar Cells, 2D Materials, and Beyond Lithium Ion Batteries.