Corrigendum: Synthesis and Characterization of an Alumina Forming Nanolaminated Boride: MoAlB.
Corrigendum: Synthesis and Characterization of an Alumina Forming Nanolaminated Boride: MoAlB.
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DOI：
10.1038/srep30339
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发表时间：
2016-08-19
影响因子：
4.6
通讯作者：
Barsoum MW
中科院分区：
文献类型：
--
作者：
Kota S;Zapata-Solvas E;Ly A;Lu J;Elkassabany O;Huon A;Lee WE;Hultman L;May SJ;Barsoum MW
The ‘MAlB’ phases are nanolaminated, ternary transition metal borides that consist of a transition metal boride sublattice interleaved by monolayers or bilayers of pure aluminum. However, their synthesis and properties remain largely unexplored. Herein, we synthesized dense, predominantly single-phase samples of one such compound, MoAlB, using a reactive hot pressing method. High-resolution scanning transmission electron microscopy confirmed the presence of two Al layers in between a Mo-B sublattice. Unique among the transition metal borides, MoAlB forms a dense, alumina scale when heated in air. Like other alumina formers, the oxidation kinetics follow a cubic time-dependence. At room temperature, its resistivity is low (0.36–0.49 μΩm) and – like a metal – drops linearly with decreasing temperatures. It is also a good thermal conductor (35 Wm−1K−1at 26 °C). In the 25–1300 °C temperature range, its thermal expansion coefficient is 9.5 × 10−6K−1. Preliminary results suggest the compound is stable to at least 1400 °C in inert atmospheres. Moderately low Vickers hardness values of 10.6 ± 0.3 GPa, compared to other transition metal borides, and ultimate compressive strengths up to 1940 ± 103 MPa were measured at room temperature. These results are encouraging and warrant further study of this compound for potential use at high temperatures.
