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Spinel ferrites
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The magnetic properties of core/shell nanoparticles (NPs) depend on the various parameters, including the magnetic interactions, but these effects have not been well studied. Here, we systematically investigated the structure and magnetic properties of Fe3O4@CoFe2O4 core/shell NPs. X-ray diffraction (XRD), scanning electron microscopy (SEM), and scanning transmission electron microscopy (STEM) confirmed the formation of Fe3O4@CoFe2O4 core/shell NPs.
6p
visergeyne
18-06-2024
0
0
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Cobalt ferrite CoFe2O4 (CFO) is a ferromagnetic material with a cubic inverse spinel structure that has the potential to be widely applied in various interdisciplinary fields ranging from information storage, electronic devices, electromagnetic interference suppressors, electromagnetic wave absorbers, sensors, catalytic to the environment, medical.
7p
viengels
25-08-2023
9
2
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In this work, we report a simple method to prepare the Fe-Ni alloy nanoparticles by reducing NiFe2O4 spinel ferrite nanoparticles at 600 °C in a hydrogen atmosphere. Structural analyses of the Fe-Ni alloy by XRD diffraction showed that the alloy sample is a complete single phase after the deoxidizing time of 12 hours.
9p
viberkshire
09-08-2023
6
5
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Magnetic spinel ferrite nanoparticles Fe2Fe1-xMnxO4 were synthesized by a simple coprecipitation method. The morphology and structures of the synthesized samples were characterized by X-ray diffraction (XRD), field-emission scanning electron microscope (FESEM), Raman spectroscopy, and infrared spectroscopy (FTIR).
17p
viannee
02-08-2023
7
3
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Luận án Tiến sĩ Kỹ thuật "Nghiên cứu chế tạo vật liệu trên cơ sở spinel ferrite ứng dụng để xử lý kim loại nặng và chất màu hữu cơ độc hại trong môi trường nước" trình bày các nội dung chính sau: Tổng quan về quá trình hấp phụ kim loại nặng và xúc tác quang hóa phân hủy chất màu hữu cơ độc hại trong môi trường nước; Quy trình tổng hợp vật liệu spinel ferrite và vật liệu tổ hợp spinel ferrite/TiO2; Kết quả đặc trưng, tính chất của vật liệu spinel ferrite và vật liệu tổ hợp.
186p
vilandrover
05-10-2022
33
4
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Bài viết Khả năng sinh nhiệt của các hạt nano CoxFe3-xO4 trình bày một vài kết quả nghiên cứu cấu trúc, tính chất từ và đốt nóng cảm ứng từ của NPs sắt từ CoxFe3-xO4 (0 ≤ x ≤ 1) được tổng hợp bằng phương pháp thủy nhiệt.
8p
vibentley
08-09-2022
11
2
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In this study, crystalline nanoparticles CoFe2O4 with a spinel structure were prepared by hydrothermal methods. The magnetic properties of non-calcined cobalt ferrite formed from nanocrystalline powders. The dependence of the particle size and crystalline structure of obtained nanoparticles in the synthesis conditions was examined and characterized using field emission scanning electron microscope (FESEM), and X-ray diffraction analysis (XRD).
10p
meyerowitz
25-12-2021
5
0
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Minoxidil (2,4-diamino-6-piperidinopyrimidine 3-oxide) was primarily recognized as a drug for reducing vascular resistance to blood flow. It was later introduced as a more important medicine for topical stimulation of hair growth and baldness reverting as well as treatment of androgenic alopecia through increasing prostaglandin endoperoxide synthesis.
18p
tudichquannguyet
29-11-2021
16
1
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Đề tài nghiên cứu pha tạp thêm oxit kim loại khác hoặc phủ spinel lên các ống carbon nano đa lớp và khảo sát hiệu quả phân hủy chất màu. Khảo sát ảnh hưởng của tỉ lệ mol ZnFe2O4 /ZnO đến khả năng phân hủy MB. Để hiểu rõ hơn mời các bạn cùng tham khảo nội dung chi tiết của khoá luận này.
65p
interstellar
18-09-2021
42
10
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CuxMg1.xFe2O4 nanoparticles were successfully synthesized by coprecipitation. The samples were calcined at 900 oC for 3 h and X-ray diffraction analysis showed that Cu0.5Mg0.5Fe2O4 had a single phase cubic spinel structure, while formation of secondary phase of Fe2O3 was observed in XRD patterns of CuFe2O4, MgFe2O4. The saturation magnetization (Ms) of Cu0.5Mg0.5Fe2O4 is in between the saturation magnetization values of CuFe2O4 and MgFe2O4 nanoparticles, CuFe2O4 is a ferromagnetic material, while MgFe2O4 and Cu0.5Mg0.5Fe2O4 show superparamagnetic behavior.
9p
nguaconbaynhay12
13-06-2021
24
1
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Single spinel phases of Mn0.5Ni0.1Zn0.4NdxFe2xO4 ferrite samples (x = 0.0, 0.01, 0.02, 0.05, 0.075, and 0.1) have been prepared by ceramic method and the composition dependence of the physical and magnetic properties has been investigated. SEM micrographs and EDX analysis revealed that there is no considerable effect for the Nd3+ ion substitution on the average grain size or porosity, whereas its concentration in the grain boundaries is higher than that in the grains. Saturation magnetization (MS) increased with the Nd3+ ion concentration (x) and reached a maximum value at x = 0.05.
5p
kethamoi1
17-11-2019
11
1
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Polyaniline–NiFe2O4 nanocomposites (PANI–NiFe2O4) with different contents of NiFe2O4 (2.5, 5 and 50 wt%) were prepared via in situ chemical oxidation polymerization, while the nanoparticles nickel ferrite were synthesized by sol–gel method. The prepared samples were characterized using some techniques such as Fourier transforms infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Moreover, the electrical conductivity and optical properties of the nanocomposites were investigated. Pure (PANI) and the composites containing 2.
8p
trinhthamhodang1
16-11-2019
17
0
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Research targets of the thesis: Fabricating spinel ferrite nanoparticle M1-xZnxFe2O4 (M = Mn, Co; 0,0 ≤x≤0,7) with controlled parameters affecting to Hc , TC and D. Establishing semi-experimental models based on experimental results to explain the correlation between SLP and (Keff, D) in order to figure out suitable mechanisms for calculating SLP value of CoFe2O4 nanoparticle.
26p
xacxuoc4321
11-07-2019
59
6
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Bài viết này trình bày các kết quả nghiên cứu tính chất từ và khả năng hấp phụ Pb2+ của các hạt nano Fe3O4 và MnFe2O4 được chế tạo bằng phương pháp đồng kết tủa hỗ trợ sóng siêu âm. Cấu trúc tinh thể, hình thái học, kích thước và tính chất từ của mẫu vật liệu được xác định bằng các phép đo phổ nhiễu xạ tia X (XRD), kính hiển vi điện tử phát xạ trường (FESEM) và từ kế mẫu rung (VSM).
7p
vimessi2711
02-04-2019
79
8
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The results also showed that the formation of cobalt ferrite spinel structures is affected by synthesis methods. Both prepared techniques were effective for the production of spinel crystalline nanoparticles. Magnetic hysteresis loop data confirmed that the magnetic properties of nanoparticles depend on the structure and size of particles.
8p
tonymina21
05-12-2018
26
2
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In this work, we present a structural, morphology and magnetic study of the Li0.5Fe2.5-xCrxO4 spinel nanoparticles (x = 0, 0.5, 0.75, 1, and 1.25) with mean particle size of 20-30 nm prepared by sol-gel method. The lattice constants and the size of particle decrease with increasing Cr concentration. In these samples, the preference of Cr3+ and Li+ ions in the octahedral sites and a small degree of site-interchange between Li+ in the octahedral sites and Fe3+ in the tetrahedral sites were found which increases with increasing the Cr content.
6p
bautroibinhyen211
26-11-2018
29
0
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Báo cáo " The effect of cobalt substitution on structure and magnetic properties of nickel ferrite "
A series of cobalt doped nickel ferrite with composition of Ni1-XCoXFe2O4 with x ranges from 0.0 to 0.8 (in steps of 0.2) was prepared by using co-precipitation method and subsequently sintered, annealed at 6000C for 3h. The influence of the Co content on the crystal lattice parameter, the stretching vibration and the magnetization of specimens were subsequently studied. XRD and FTIR were used to investigate structure and composition variations of the samples. All samples were found to have a cubic spinel structure. ...
7p
tuanlocmuido
19-12-2012
43
2
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Among spinel ferrites, Cd and Zn ferrites are always normal ferrites with Cd and Zn ions locating only in tetrahedral sites. This study presents effect of Zn on the magnetic and magnetocaloric properties of the mixed spinel ferrites Ni1-xZnxFe2O4 (x = 0.60, 0.65, 0.70, 0.75). The presence of Zn affects lattice parameters, saturation magnetization Ms, Curie temperature, Tc, and magnetic entropy change ∆Sm. At highest Zn content, Tc reduces to the temperature lower than room temperature and magnetic structure of spins in the octahedral sublattice should be strongly canted. ...
8p
tuanlocmuido
19-12-2012
46
1
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