Preparation of microcrystalline graphite/zinc ferrite composites with enhanced and tunable electromagnetic wave absorption using a high-temperature ball milling method. (May 2023)

• Record Type: Journal Article
• Authors: Liu, Mingzhe; Chen, Jianshe; Li, Binchuan; Wang, Bo; Han, Qing; Wei, Shicheng; Liu, Kuiren; He, Xiaocai
• Is Part Of: Materials research bulletin. Volume 161(2023)
• Publication Date: 2023-05
• Subjects: A. Microcrystalline graphite -- A. Zinc ferrite -- B. High-temperature ball milling -- D. Electromagnetic wave absorption properties; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2023.112170
• Languages: English
• ISSNs: 0025-5408

Abstract

Highlights: Application of microcrystalline graphite in microwave absorbing materials. Microcrystalline graphite/ZnFe2 O4 were prepared by high-temperature ball milling. Microcrystalline graphite/ZnFe2 O4 showed reflection loss of −62.90 dB at 6.0 GHz. Microwave absorption of composites originally from dielectric loss and magnetic loss. Abstract: Microcrystalline graphite (MG)/zinc ferrite (ZFO) composites were prepared by a high-temperature ball milling method. The magnetic and microwave absorption properties of MG/ZFO composites were analyzed in the frequency range of 2.0–18.0 GHz. The results showed that MG has a favorable impact on the microwave absorption capacity of ZFO. The composites containing 10 wt% MG had a minimum reflection loss of −62.90 dB, which is almost a factor of 12 higher than for pure ZFO, and their effective absorption bandwidth (EAB, RL <−10 dB) covers frequency range of 5.84–7.92 GHz for a matching thickness of 3.9 mm, and for a matching thickness of 1.8 mm, the EAB covers frequency range of 12.87–17.70 GHz. A probable mechanism of microwave absorption for MG/ZFO composites is based on a synergistic combination of dielectric and magnetic losses. The attractive properties of prepared composites indicate that they are promising and competitive materials for use in microwave absorption. Graphical abstract: Image, graphical abstract