Affiliation:
1. School of Physics Harbin Institute of Technology Harbin 150001 China
2. Heilongjiang Provincial Key Laboratory of Plasma Physics and Application Technology Harbin Institute of Technology Harbin 150001 China
3. Key Laboratory for Neutron Physics of CAEP Institute of Nuclear Physics and Chemistry Mianyang 621999 China
Abstract
AbstractMicrostructures play a critical role to influence the polarization behavior of dielectric materials, which determines the electromagnetic response ability in gigahertz. However, the relationship between them, especially in the solid‐solution structures is still absent. Herein, a series of (Ti1‐yNby)2AlC MAX phase solid solutions with nano‐laminated structures have been employed to illuminate the aforementioned problem. The relationship has been investigated by the lattice distortion constructed via tuning the composition from Ti to Nb in the M‐site atomic layer. Experimental characterizations indicated that the dielectric response behaviors between declined conduction loss and boosted polarization loss can be well balanced by niobium atom manipulative solid‐solution engineering, which is conducive to impedance matching and electromagnetic absorption performance. Theoretical calculation further proved that the origin of electric dipoles is ascribed to the charge density differences resulting from the altered microscopic atomic distribution. As a result, the Ti1.2Nb0.8AlC exhibits the mostly optimized microwave absorption property, in which a minimum reflection loss of −42 dB and an effective absorption bandwidth of 4.3 GHz under an ultra‐thin thickness of 1.4 mm can be obtained. This work provides insight into the structural engineering in modifying electromagnetic response performance at gigahertz and which can be expanded to other solid‐solution materials.
Funder
National Natural Science Foundation of China
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
13 articles.
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