Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 8, Pages 7601-7610Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15379
Keywords
microwave absorption; LaFeO3/C; dipole polarization; deficiency; perovskites
Funding
- National Natural Science Foundation of China [51371154, 51571167, 51171158]
- Fundamental Research Funds for the Central Universities [20720140547]
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Development of microwave absorption materials with tunable thickness and bandwidth is particularly urgent for practical applications but remains a great challenge. Here, two-dimensional nanocomposites consisting of perovskite oxides (LaFeO3) and amorphous carbon were successfully obtained through a one pot with heating treatment using sodium chloride as a hard template. The tunable absorption properties were realized by introducing A-site cation deficiency in LaFeO3 perovskite. Among the A-site cation-deficient perovskites, La0.62FeO3/C (L0.62FOC) has the best microwave absorption properties in which the maximum absorption is -26.6 dB at 9.8 GHz with a thickness of 2.94 mm and the bandwidth range almost covers all X-band. The main reason affecting the microwave absorption performance was derived from the A-site cation deficiency which induced more dipoles polarization loss. This work proposes a promising method to tune the microwave absorption performance via introducing deficiency in a crystal lattice.
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