The Effect of Sintering Conditions on the Power Loss Characteristics of Mn-Zn Ferrites for High Frequency Applications

Abstract

The sintering temperature significantly changed the microstmcture and effected the power loss behavior at the frequency range over 100kHz. The best power loss characteristics at 100kHz-200mT and 500kHz-50mT were obsemed in the samples sintered at 1300°C and 125OoC, respectively. Those results indicated that the power loss depended on the grain size, electrical resistivity and density of sintered cores. To maintain the stoichiometry at the sintering condition, the fenite cores were processed on the isocomposition lines within the spine1 phase boundary when being cooled. The zinc vapor pressure as well as the oxygen partial pressure was controlled. The high zinc loss condition had an adverse effect on the microstructure of the sintered core surface and degraded the power loss characteristics.

Effect of zinc concentration on the structural, electrical and magnetic properties of mixed Mn–Zn and Ni–Zn ferrites synthesized by the citrate precursor technique

“…2(a), while samples sintered at 1400 1C posses much larger grains. The higher grain size for the samples sintered at 1400 1C may be attributed to the formation of Fe 2+ ions, which accelerate the growth rate of the grains [17,18]. Increase in grain size with zinc content can be seen in the photomicrographs shown in Figs Table 3 shows the compositional dependence of Curie temperature, T c , obtained from the inductance versus temperature profiles of different compositions.…”

Influence of sintering temperature on the structural, magnetic and dielectric properties of Ni0.8Zn0.2Fe2O4 synthesized by co-precipitation route

“…Samples sintered at 700 • C possess comparatively very small grains less than 1 m while samples sintered at 1300 • C possess much larger grains. The higher grain size for the sample sintered at 1300 • C may be attributed to the formation of Fe 2+ ions, which accelerate the growth rate of the grains [14,15]. It is observed that grain size of the samples under investigation is smaller than that prepared by ceramic method [16].…”

Antenna Using a Magnetic-Slab Located in the Principal Magnetic-Field Region Beneath the Patch

“…For the accomplishment, a magnetic-slab embedded within the original dielectric substrate of an antenna in the prime H-field region beneath the patch reduced f o of a conventional patch, design a, with moderate impact on its performance and is perceived as a potential to miniaturisation. However, compared to a larger volume design with a 3D dielectric ridge, design c, performance needs to be improved to be fully considered as an alternative and is conjectured to be probable using forthcoming/pending magnetic materials with improved performance by means of better sintering conditions on the power loss [19] with high saturation magnetic flux density and low power loss at high temperature [20]. The magnetic-slab antenna can benefit from mixtures/composites with a higher degree of pure magnetic material (magnetization).…”