Synthesis and Microwave Absorption Properties of Novel Bi1/2(Na0.8K0.2)1/2TiO3/Fe3O4 Composite

IF 1.2 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials Transactions Pub Date : 2023-10-01 DOI:10.2320/matertrans.mt-mg2022026

Nguyen Dang Co, Bui Dai Phat, Phan Van Khai, Tran Quang Dat, Ho Thi Anh, Nguyen Tran Ha, Le Viet Cuong, Nguyen Huy Tiep, Nguyen Thi Minh Hong, Dang Duc Dung, Ngo Duc Quan, Tran Mau Danh, Phan The Long, Pham Duc Thang, Bui Dinh Tu

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Abstract

The combination of two dielectric-magnetic components in the same composite has been shown to significantly improve the effectiveness of electromagnetic (EM) shielding and microwave absorption (MWA) because they have both a combination of high dielectric and magnetic losses and good impedance matching. The novel Bi1/2(Na0.8K0.2)1/2TiO3/Fe3O4 (BNKT/Fe3O4) composite has been successfully synthesized by a two-step method with wide effective absorption bandwidth (EAB = 16 GHz) in the high-frequency (2–18 GHz). It was evident that the MWA efficiency of the BNKT/Fe3O4 composite has been significantly improved compared with pure Bi1/2(Na0.8K0.2)1/2TiO3 or Fe3O4 materials. In addition, the BNKT/Fe3O4 composite could achieve reflection loss (RL = −39.41 dB, ∼99.99% at 10.16 GHz) with a sample thickness optimal (d = 4.7 mm). This work shows that the novel BNKT/Fe3O4 composite has excellent MWA properties, all contributing to a potential candidate in the electromagnetic wave absorption and shielding fields.

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新型Bi1/2(Na0.8K0.2) TiO< 1/2TiO< 3O4;复合

在同一复合材料中结合两种介电-磁元件可显著提高电磁(EM)屏蔽和微波吸收(MWA)的有效性，因为它们具有高介电和磁损耗的组合以及良好的阻抗匹配。采用两步法成功合成了新型Bi1/2(Na0.8K0.2)1/2TiO3/Fe3O4 (BNKT/Fe3O4)复合材料，在高频(2 ~ 18 GHz)范围内具有宽的有效吸收带宽(EAB = 16 GHz)。与纯Bi1/2(Na0.8K0.2)1/2TiO3或Fe3O4材料相比，BNKT/Fe3O4复合材料的MWA效率明显提高。此外，BNKT/Fe3O4复合材料可以在最佳样品厚度(d = 4.7 mm)下实现反射损耗(RL =−39.41 dB, 10.16 GHz时为~ 99.99%)。这项工作表明，新型的BNKT/Fe3O4复合材料具有优异的MWA性能，这些都有助于电磁波吸收和屏蔽领域的潜在候选材料。

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