Facile synthesis of hierarchical A-site cation deficiency perovskite LaxFeO3-y/RGO for high efficiency microwave absorption. (August 2020)

• Record Type: Journal Article
• Authors: Jia, Zirui; Gao, Zhenguo; Kou, Kaichang; Feng, Ailing; Zhang, Chuanhui; Xu, Binghui; Wu, Guanglei
• Is Part Of: Composites communications. Volume 20(2020)
• Publication Date: 2020-08
• Subjects: A-site cation deficiency -- LaFeO3 -- Carbon nanosheet -- Electromagnetic microwave absorption
• DOI: 10.1016/j.coco.2020.04.010
• Languages: English
• ISSNs: 2452-2139

Abstract

Abstract: Wafer biscuit structure like hierarchical A-site cation deficiency perovskite at carbon and RGO hybrid composites-Lax FeO3-y /RGO are fabricated by a simple one-pot route. The quantitative ratios of A-site cation deficiency are designed, and was represented by x = 1.0, 0.8, 0.6, 0.4 and 0.2, respectively. Besides the morphology and phase structure, but the chemical composition, especially the O vacancy induced by the deficiency, was also studied by X-ray photoelectron spectroscopy (XPS) data. The electromagnetic microwave absorption capabilities of these composites were further studied. Accompanying with the appearance of A-site cation deficiency, the reflection loss (RL) was optimized instinctively. The minimum RL of La0.8 FeO3-y /RGO reaches −36.23 dB with an effective band (RL ≤ −10dB) width of 3.92 GHz from 11.68 to 15.60 GHz at the matching thickness 2.00 mm, which was demonstrated the domain role of dielectric loss ascribed to the polarization of dipoles between O vacancy and Fe 4+ . When the deficiency increased, the band widths reached 4.72 GHz with the synergistic effect of magnetic and dielectric phase. Highlights: Lax FeO3-y /RGO composite were prepared by facile hard template method and one-step hydrothermal method. The polarization of dipoles between O vacancy and Fe 4+ provides an efficient electromagnetic wave absorbers. The minimum RL value is −36.23 dB with the thickness of 2 mm, and the effective absorption bandwidth is 3.92 GHz.