Physical, electrical and magnetic properties of nanocrystalline Zr–Ni doped Mn-ferrite synthesized by the co-precipitation method

Physical, electrical and magnetic properties of nano-sized Co-Cr substituted magnesium ferrites

“…6). Spinel ferrites have been previously doped with Ca 2þ , 25 Zn 2þ , 26 Zr-Mn, 27 Co-Ni, 28 and ZrNi, 29 and their room temperature resistivity is found to be in the range of 10 6 -10 7 X cm which is $100 times less than that achieved in this study. So, Co-Cr doped materials can be suitable to curb the eddy current losses for microwave applications.…”

Phase composition and magnetic properties of Ni1-xCoxFe2O4 nanocrystals with spinel structure, synthesized by Co-precipiation

“…Among magnetic materials, nanocrystalline ferrites with a spinel structure of type MFe 2 O 4 (M = Co, Ni, Zn, Mn) are distinguished by high permeability, saturation magnetization and are used to produce new multifunctional materials, such as high-frequency devices, due to the decreased Foucault currents and increased duration of their functioning [1][2][3][4][5]. In addition, ferrites with a spinel structure are cheaper and more stable (in terms of time and temperature) compared to metals and alloys.…”

“…The magnetic and electrical characteristics of these ferrites depend on their chemical composition, cation location, particle size, dopant content and the synthesis method [1][2][3][4][5][6][7][8][9]. CoFe 2 O 4 is hard magnetic ferrite with a high coercive force H c > 1500 Oe, with an average saturation magnetization of M s ∼ 40 emu/g [10].…”

“…CoFe 2 O 4 is hard magnetic ferrite with a high coercive force H c > 1500 Oe, with an average saturation magnetization of M s ∼ 40 emu/g [10]. NiFe 2 O 4 is a soft magnetic material characterized by small values of coercive force, saturation magnetization and excessive magnetization (H c = 46.46 Oe, M s = 8.8 emu/g, M r = 0.2 emu/g) [1][2][3]. Different magnetic properties of ferrites are required for different applications and can be achieved in several ways: either by controlling the particle size, or by changing the concentrations of hard and soft magnetic phases in the material by introduction of another element (dopant) or by the formation of coatings on SiO 2 [11][12][13][14].…”

“…In previous studies [1,12], MFe 2 O 4 nanocrystals (M = Co, Ni) were obtained by co-precipitation of M 2+ and Fe 3+ cations at room temperature with the addition of an aqueous ammonia at pH = 11. However, at pH = 11, Co(OH) 2 and Ni(OH) 2 are dissolved with the formation of complexes with ammonia in accordance with the following equation:…”