Article
Materials Science, Ceramics
G. R. Patta, V. Chitti Babu, V. Ravi Kumar, N. Veeraiah
Summary: In this study, cobalt ferrite nanocrystalline powders were prepared with different chelating agents/gelation promoters through sol-gel method, and the samples prepared with lower molecular weight chelating agent showed higher saturation magnetization. The reasons for this phenomenon were identified and discussed in the analysis of the results.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Xiang Yu, Lichen Wang, Ruoshui Liu, Ningfang Zhou, Zhiyi Xu, Huayang Gong, Tongyun Zhao, Jirong Sun, Fengxia Hu, Baogen Shen
Summary: We synthesized Sr1-xNdxFe12-yCoyO19 (x = 0-0.25, y = 0-0.1) using a conventional ceramic route and analyzed the crystal structures using X-ray diffraction. With increasing Nd3+ and Co2+ contents, lattice constant a increases, while lattice constant c decreases. The magnetic properties are improved when x = y = 0.1 (equal co-substitution), and further improved when x is increased (unequal co-substitution), reaching optimum values of Ms = 76.4 emu/g and Hc = 5115 Oe due to the occupation of the 2a site by divalent Fe2+. The occupancies of Co2+ and Fe2+ are further verified using Raman spectroscopy.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Jin-Young You, Kang-Hyuk Lee, Young-Min Kang, Sang-Im Yoo
Summary: In this study, charge-balanced Si4+-M-1+,M-2+ substitution compositions were synthesized and found to enhance the magnetic performance of SrFe12-2xSixMgxO19 and SrFe12-z(Si0.6Li0.6)(z)O-19 compounds.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Reena Dhyani, R. C. Srivastava, Gagan Dixit
Summary: This study focuses on the investigation of magnetic and temperature-dependent dielectric properties of Co-CuFe2O4 nanoferrites. Cu0.5Co0.5Fe2O4 nanoparticles exhibit the highest magnetic properties and lower dielectric loss, making them potential candidates for high density magnetic recording media and power transformers at high frequencies.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Ceramics
Zhao Li, Guixiang Liu, Yong Ren, Fang Xu, Bo Dai, Yong Zhao, Xingwu Yuan, Jiongming Li, Dengjian Ye
Summary: The effects of different parameters of spark plasma sintering (SPS) on LiNiZn ferrite ceramics were investigated. Compared with traditional sintering, SPS resulted in finer, more uniform grains, denser structure, higher saturation magnetization, and lower ferromagnetic resonance linewidth. The cation distribution was analyzed and a method of judging specific saturation magnetization was proposed. SPS can effectively improve the magnetic properties of ferrite ceramics and provide an alternative pathway for high-performance soft magnetic ferrite.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Muhammad Junaid, Ijaz Ahmad Qazafi, Muhammad Azhar Khan, Shagufta Gulbadan, Syed Zafar Ilyas, H. H. Somaily, Mohamed S. Attia, Mohammed A. Amin, H. M. Noor ul Huda Khan Asghar
Summary: The impact of Ni2+ and Zr4+ on the physical properties of LiFe2O4 ferrites synthesized via the microemulsion technique was investigated. The substitution of Ni2+ and Zr4+ ions led to changes in lattice constant, crystallite size, X-ray density, dielectric parameters, and magnetic properties of lithium ferrites.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Jun-Pyo Lim, Eel-Ho Yun, Young-Min Kang
Summary: Enhanced hard magnetic properties were achieved in M-type hexaferrite by optimizing the substitution levels of Mn, Al, and Si for Fe, and Ca for Sr. The addition of Al-Si-Mn effectively controlled crystallite growth, resulting in increased coercivity (HC), while causing a decrease in the remanent magnetization (4 pi Mr). This development shows promise as it eliminates the need for expensive cobalt in high-performance permanent magnets.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Jun-Pyo Lim, Min-Gu Kang, Young-Min Kang
Summary: Enhanced permanent magnet performance was reported for multi-cation-substituted M-type Sr-hexaferrites prepared using conventional ceramic processes. A cation composition of Sr0.4Ca0.3La0.3Fe10.2Co0.1Mn0.1Si0.05Mg0.05O19 was obtained through stepwise and systematic cation composition designs, processing, and characterization. The magnet demonstrated improved coercivity and residual magnetic flux density compared to the non-substituted SrFe12O19 magnet.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Ceramics
R. L. Silva, J. H. Araujo, A. C. Lima, E. C. Rocha, M. A. Morales, A. S. Carrico
Summary: In this study, single phase Sm doped Co-ferrites nanoparticles were synthesized and characterized, with the saturation magnetization and coercivity field decreasing as the concentration of Sm3+ increased. The cation distribution was found to correspond to a partially inverted ferrite, and the magnetocrystalline anisotropy energy was determined from hysteresis curves. The results were in close agreement with the experimental results due to the presence of superparamagnetic and thermally blocked nanoparticles.
CERAMICS INTERNATIONAL
(2021)
Article
Physics, Applied
J. N. Pavan Kumar Chintala, S. D. Kaushik, M. Chaitanya Varma, G. S. V. R. K. Choudary, K. H. Rao
Summary: The structural and magnetic properties of nanocrystalline Ni0.65Zn0.35Fe2O4 synthesized by sol-gel method were analyzed using various characterization techniques. The high specific saturation magnetization of 176 emu/g at 10 K was discussed in terms of core-shell contributions based on spin canting. The proposed cation distribution relied on infield Mossbauer spectra and Rietveld analysis to provide insight for improving the material properties suitable for high-frequency applications.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Environmental Sciences
J. F. Joe Sherin, T. C. Bessy, S. Asha, C. Vijaya Kumar, Dina Huessien, M. R. Bindhu, Rabab Ahmed Rasheed, Khaloud Mohammed Alarjani
Summary: A novel photocatalyst based cobalt doped zinc ferrites nanoparticles (Co-ZnFe2O4 NPs) was prepared and characterized in this study. The results showed that the amorphous ferrites of the samples disappeared with increasing calcinations temperature, affecting the band gap energy and the intensity of photoluminescence peak. Cobalt substitution improved the saturation magnetization and antimicrobial activity of the samples.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Xuhang Zhang, Yaqiang Dong, Changjiu Wang, Aina He, Jiawei Li, Fushan Li, Liang Chang, Qiang Chi, Xiaoxue Shui
Summary: The influence of phosphorus content on Fe81.5Si3B10+xP3.5-xC0.2Cu0.8Nb1 alloys has been studied, showing improvements in Curie temperature and saturation magnetic flux density with decreased P content. Optimal magnetic field annealing technique results in amorphous alloys with good soft magnetic properties, indicating the importance of phosphorus content and annealing conditions in enhancing magnetic performance.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
S. Udhayakumar, G. Jagadish Kumar, J. Arout Chelvane, K. Kamala Bharathi
Summary: In this study, LiCoxFe5-xO8 nanoparticles with different Co concentrations were prepared by sol-gel method. The detailed structural parameters, Mössbauer spectra, and magnetic properties were analyzed. The results show that the structural parameters and magnetic properties of LiCoxFe5-xO8 nanoparticles change with increasing Co concentration.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Polymer Science
R. Dilip, R. Jayaprakash
Summary: In this study, M-doped BaFe2O4 (M-Co, Ni, and Mn) nanoparticles were synthesized via auto combustion method, with the weight percentage of metals optimized. XRD and FTIR confirmed the structural and vibrational characteristics of the materials, while FESEM and TEM images visualized morphological changes induced by the surfactant n-heptane. The magnetic properties were analyzed using VSM, revealing ferromagnetic behavior, and dielectric constant variations were examined through dielectric studies.
JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
M. Sumalatha, S. Shravan Kumar Reddy, M. Sreenath Reddy, Suresh Sripada, M. Manivel Raja, Ch Gopal Reddy, P. Yadagiri Reddy, V. Raghavendra Reddy
Summary: In this study, cobalt ferrite doped with indium was synthesized using the sol-gel method, resulting in phase-pure samples with confirmed ferrimagnetic ordering. The cation distribution was obtained through the combined analysis of Raman and Fe-57 Mossbauer spectroscopy measurements, with the magnetic moment values matching qualitatively with experimental values.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2021)