The Experts below are selected from a list of 264 Experts worldwide ranked by ideXlab platform
W F Egelhoff - One of the best experts on this subject based on the ideXlab platform.
-
a comparison of the magnetic characteristics of nanocrystalline nickel zinc and manganese Ferrites synthesized by reverse micelle technique
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2004Co-Authors: R D K Misra, S Gubbala, A Kale, W F EgelhoffAbstract:Abstract Nanocrystalline nickel, zinc and manganese Ferrites synthesized by reverse micelle synthesis technique were characterized by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction techniques, and the magnetic behavior studied by Superconducting Quantum Interference Device (SQUID). The three Ferrites exhibit blocking temperatures of 16, 20, and 35 K, respectively. The difference in the blocking temperatures was attributed to the magnetocrystalline anisotropy and L–S coupling. The saturation magnetization of the three Ferrites at 300 K was 25, 8, and 6 emu/g, respectively and at 2 K was 35, 17, and 15 K, respectively. The lower saturation magnetization in the case of nickel and manganese Ferrite compared to their bulk counterparts is attributed to a core-shell like particle morphology. The increase in the saturation magnetization in the case of zinc Ferrite nanoparticles is attributed to the change in the cation distribution from a normal spinel to a mixed spinel structure in the nanocrystalline form.
Vitaly Vlasov - One of the best experts on this subject based on the ideXlab platform.
-
Thermomagnetometric analysis of nickel–zinc Ferrites
Journal of Thermal Analysis and Calorimetry, 2020Co-Authors: A. L. Astafyev, A. P. Surzhikov, Elena Lysenko, Evgeniy Nikolaev, Vitaly VlasovAbstract:In this paper, magnetic phase transitions of nickel–zinc Ferrites (Ni_1−xZn_xFe_2O_4) with a zinc content of 0 ≤ x _Zn ≤ 0.7 were studied using the thermomagnetometric method, which is a thermogravimetric analysis with a constant magnetic field applied. The studied Ferrites were made from oxide powders using ceramic technology. The Curie point was determined from the derivative thermogravimetric curve in the region of magnetic phase transition. The Curie temperature calibration curve was obtained against the degree of doping of nickel Ferrite with zinc to detect the magnetic phases by the Curie temperature. Thermal analysis of multicomponent magnetic mixtures that consist of nickel–zinc Ferrites with different zinc contents was performed. The dependence of the change in mass during magnetic phase transition on the mass content of the magnetic phase in the Ferrite mixture was revealed.
Rueyshin Juang - One of the best experts on this subject based on the ideXlab platform.
-
an overview of the structure and magnetism of spinel Ferrite nanoparticles and their synthesis in microemulsions
Chemical Engineering Journal, 2007Co-Authors: Daliya S Mathew, Rueyshin JuangAbstract:In this review, we attempt to describe the structure of various spinel Ferrites like zinc Ferrite, nickel–zinc Ferrite, manganese–zinc Ferrite and cobalt Ferrite. It also describes the important magnetic properties of these spinel Ferrites. The focus then shifts to the use of microemulsions as nanoreactors for the synthesis of spinel Ferrites. This work gives a short review on the various synthesis methods of spinel Ferrites in microemulsions in the recent years.
A. L. Astafyev - One of the best experts on this subject based on the ideXlab platform.
-
Thermomagnetometric analysis of nickel–zinc Ferrites
Journal of Thermal Analysis and Calorimetry, 2020Co-Authors: A. L. Astafyev, A. P. Surzhikov, Elena Lysenko, Evgeniy Nikolaev, Vitaly VlasovAbstract:In this paper, magnetic phase transitions of nickel–zinc Ferrites (Ni_1−xZn_xFe_2O_4) with a zinc content of 0 ≤ x _Zn ≤ 0.7 were studied using the thermomagnetometric method, which is a thermogravimetric analysis with a constant magnetic field applied. The studied Ferrites were made from oxide powders using ceramic technology. The Curie point was determined from the derivative thermogravimetric curve in the region of magnetic phase transition. The Curie temperature calibration curve was obtained against the degree of doping of nickel Ferrite with zinc to detect the magnetic phases by the Curie temperature. Thermal analysis of multicomponent magnetic mixtures that consist of nickel–zinc Ferrites with different zinc contents was performed. The dependence of the change in mass during magnetic phase transition on the mass content of the magnetic phase in the Ferrite mixture was revealed.
-
Thermomagnetometric analysis of lithium Ferrites
Journal of Thermal Analysis and Calorimetry, 2018Co-Authors: A. L. Astafyev, Elena N. Lysenko, A. P. SurzhikovAbstract:In this work, the magneto-phase transitions in pure lithium (Li0.5Fe2.5O4), lithium–zinc (Li0.4Fe2.4Zn0.2O4) and lithium–titanium (Li0.6Fe2.2Ti0.2O4) Ferrites were studied by the thermogravimetric analysis in magnetic field, which is known as the thermomagnetometry method. The Ferrites were prepared by the solid-state synthesis from oxides and carbonates. The Curie point of magnetic phase in Ferrites and their composite mixtures was determined from the derivative thermogravimetric curve in the region of Ferrite mass change associated with the ferrimagnet–paramagnet transition in the magnetic phase. The method based on the analysis of Ferrite mass change at Curie temperature was developed to estimate the Ferrite phase concentrations in composite magnetic materials.
R D K Misra - One of the best experts on this subject based on the ideXlab platform.
-
a comparison of the magnetic characteristics of nanocrystalline nickel zinc and manganese Ferrites synthesized by reverse micelle technique
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2004Co-Authors: R D K Misra, S Gubbala, A Kale, W F EgelhoffAbstract:Abstract Nanocrystalline nickel, zinc and manganese Ferrites synthesized by reverse micelle synthesis technique were characterized by high-resolution transmission electron microscopy (HRTEM) and X-ray diffraction techniques, and the magnetic behavior studied by Superconducting Quantum Interference Device (SQUID). The three Ferrites exhibit blocking temperatures of 16, 20, and 35 K, respectively. The difference in the blocking temperatures was attributed to the magnetocrystalline anisotropy and L–S coupling. The saturation magnetization of the three Ferrites at 300 K was 25, 8, and 6 emu/g, respectively and at 2 K was 35, 17, and 15 K, respectively. The lower saturation magnetization in the case of nickel and manganese Ferrite compared to their bulk counterparts is attributed to a core-shell like particle morphology. The increase in the saturation magnetization in the case of zinc Ferrite nanoparticles is attributed to the change in the cation distribution from a normal spinel to a mixed spinel structure in the nanocrystalline form.
