Crystalline and electronic structure and magnetic properties of La-doped Ba3Co2Fe24O41 hexaferrites

Enhanced microwave absorption features of Ba3Co2Fe24O41 hexaferrite by high lanthanium doping concentration

“…43 The increase in H c could also originate from the exchange interactions between Fe 2+ and Fe 3+ ions at different blocks in the Z-type structure. 32 Considering the H c values of samples without epoxy, the mixing with epoxy rapidly increased the H c , as listed in Table 2. The values of H c of epoxied-samples were 158.5% to 195.5% compared to La-Co 2 Z, meaning that the H c of epoxied-samples was 1.5 to 2 times higher than the as-prepared ones.…”

“…La-doping Ba 3 Co 2 Fe 24 O 41 (x = 0, 0.1, 0.3, and 0.5) samples were fabricated by the solid-state reaction method, which has been described in detail in our previous work. 32 Briefly, appropriate amounts of precursors with high purity of BaCO 3 , La 2 O 3 , Co 2 O 3 , and Fe 2 O 3 were mixed, pressed into button shapes, and then annealed at 1000 • C for 12 h. The annealed products were ground, pressed into a button shape again, and then sintered at 1260 • C for 10 h to get the final products. The morphological and structural properties of as-prepared samples were investigated using a field-emission scanning electron microscopic (FE-SEM, Hitachi S-4800) and X-ray diffractometer (XRD, Rigaku, MiniFlex) equipped with a Cu-Kα radiation source (λ = 154056 Å) operating at 30 kV and 15 mA, respectively.…”

“…In order to enhance the microwave absorption performance in both terms of RL and EAB of Z-type hexaferrite-based materials, we fabricated high La-doping concentration samples as potential MAs. To the best of our knowledge, there were few studies about Ladoping barium Z-type hexaferrite [23][24][25]32 as well as an investigation on its microwave absorption performance. In a previous study, we reported the effects of La-doping on the electronic structure and structural and static magnetic properties of Ba 3 Co 2 Fe 24 O 41 .…”

“…In a previous study, we reported the effects of La-doping on the electronic structure and structural and static magnetic properties of Ba 3 Co 2 Fe 24 O 41 . 32 In this study, we presented a detailed investigation on the microwave absorption performance of La-doped Ba 3 Co 2 Fe 24 O 41 with variations in the thickness of 0.25-6 mm and frequency of 2-18 GHz.…”

“…To the best of our knowledge, there were few studies about La‐doping barium Z‐type hexaferrite 23–25,32 as well as an investigation on its microwave absorption performance. In a previous study, we reported the effects of La‐doping on the electronic structure and structural and static magnetic properties of Ba 3 Co 2 Fe 24 O 41 32 . In this study, we presented a detailed investigation on the microwave absorption performance of La‐doped Ba 3 Co 2 Fe 24 O 41 with variations in the thickness of 0.25–6 mm and frequency of 2–18 GHz.…”