From binary to ternary and back to binary: Transition of electromagnetic wave shielding to absorption among MAB phase Ni3ZnB2 and corresponding binary borides Nin+1Bn (n=1, 3)
Journal of Advanced Ceramics(2023)
摘要
Due to chemical inertness of nickel and boron, the preparation of nickel borides and corresponding layered ternary transition metal borides Ni3ZnB2 (MAB phase) has always required high-temperature and/or high-pressure conditions. Yet, an innovative and efficient approach to preparing Ni3ZnB2 at only 600 degrees C and without applied pressure is presented in this study. It is discovered that by simply adjusting the temperature, a phase transition from Ni3ZnB2 to Ni4B3 with a layered structure could be induced. This transition between the binary-component and the ternary-component brings about significant variation in electromagnetic wave (EMW) shielding/absorption performance of prepared borides. For instance, Ni2B has good EMW shielding performance (42.54 dB in X band) and Ni3ZnB2 is of weak EMW shielding (13.43 dB in X band); Ni3ZnB2 has poor EMW absorption performance (-5 dB) while Ni4B3 has excellent EMW absorption performance (-45.19 dB) at a thickness of 2.7 mm with effective absorption bandwidth (10.4 GHz).
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关键词
nickel borides,Ni3ZnB2,electromagnetic wave (EMW) shielding properties,electromagnetic wave absorbing properties
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