Low-temperature co-fired Ni–Ti co-substituted barium ferrites

Abstract

Divalent Ni2+ ion and tetravalent Ti4+ ion equiatomic co-substituted two trivalent Fe3+ ions of M-type barium ferrite in the form of Ba(NiTi)xFe12-2xO19 with x = 1.0, 1.1, 1.2, 1.3. The samples were prepared using solid state reaction route and added 2.5 wt% Bi2O3 to lower sintering temperature. The samples were sintered at 925℃ and 950℃ for 6 h. As the Ni–Ti molar content changed from 1.0 to 1.3, all XRD patterns showed the single phase of the M-type barium ferrite without other intermediate phase. The microstructures were analyzed with scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The saturation magnetization Ms (49.74–29.58 emu/g) and the coercivity Hc (426.44–329.63 Oe) decreased with increasing Ni–Ti composition x and indicated that a decrease of magnetic moment and anisotropy was achieved by substitution of Ni–Ti. These properties attribute to Ni and Ti occupancies at different sites in the barium ferrite crystalline structure.

Improving Magnetic Properties of BiFeO₃-BaFe₁₂O₁₉ Solid Solution by Different Sintering Time and Temperatures of Sol-Gel Method

“…The excellent properties of BaFe12019 among other are high frequency field, large saturation magnetization and high coercive force [7]. In this research, it is alloyed ceramics of BiFe03 and BaFe12019 together hoping to improve magnetic properties which could improve value of magnetoelectric coupling (related to higher quality of multiferroic materials).…”

A Study on Synthesis, Structural and Magnetic Properties of La2O3 Doped Isotropic Ba-M Ferrites

“…al [7] developed Ba-M ferrite magnet with micro alloying of rare earth elements (La 3+ , Nd 3+ and Sm 3+ ) which results to decrease B r and increase H c from 2.87 to 3.34kOe. Transition metals like Co 3+ , Cu 2+ and Ti 3+ [8] have beneficial effects in improving magnetic properties and perfecting microstructure. Nowosielski et al [9] reported the effect of ball milling and annealing temperature on crystallite size, phase development and magnetic properties of BaFe 12 O 19 .…”

Microwave absorption properties of Ag naowires/carbon black composites

“…Due to the large electric or magnetic loss, the ferrites and metal-based composites regarded as one of the candidates for EM wave absorbers have particularly aroused the interest of researchers. [2][3][4][5][6][7][8] However, the ferrites and metal-based composite absorbing materials have their own disadvantages such as relatively large thickness, high manufacturing cost, high electrical conductivity, and narrow absorption bandwidth, which restrict their widespread applications. It is necessary to seek for thin and lightweight materials with strong microwave absorption properties.…”