Effect of Tin Additive on the Microstructure and Loss of Ferrite for Switching Mode Power Supply

Abstract

High frequency manganese-zinc ferrite was prepared by oxide ceramic process. The microstructure of representative samples was analyzed by scanning electron microscope (SEM). In addition, the resistivity (ρ) of samples was tested by YY2812 LCR meter and the magnetic properties were obtained by SY-8232 B-H Analyzer. In combination with the microstructure analysis of material, the effects of SnO 2 additive in MnZn ferrite were investigated, especially on initial permeability (µ i ), resistivity (ρ), hysteresis loss (P h ), eddy current loss (P e ) and residual loss (P r ). The results show that the amount of SnO 2 additive has an obvious influence on the microstructure and electromagnetic properties of the proposed material, such as µ i , ρ, P h , P e and P r . There is an optimum content of SnO 2 which is 0.1% to ensure finer microstructure and lower loss at the frequency of 1MHz.

Microstructure and magnetic properties of Sn-substituted MnZn ferrites

“…Recently, ferrites doped with SnO 2 additive were reported by Sun et al [7,9] and Znidarsic and Drofenik [8] to obtain low-loss MnZn ferrites with fine grains, while the precursors of ferrites are three oxides, Fe 2 O 3 , MnO and ZnO. In addition, Sn-substituted MnZn ferrites were investigated by Das et al [10] to improve the microstructure and magnetic property.…”

“…It was reported that by replacing with high-valency cations such as Nb 5+ [3], Ti 4+ [4][5][6][7][8], Sn 4+ [7][8][9][10][11] and Ge 4+ [11], which are soluble in MnZn ferrites lattice and occupy the regular positions on the tetrahedral or octahedral sites, the microstructure and magnetic properties of MnZn ferrites would change significantly. Recently, ferrites doped with SnO 2 additive were reported by Sun et al [7,9] and Znidarsic and Drofenik [8] to obtain low-loss MnZn ferrites with fine grains, while the precursors of ferrites are three oxides, Fe 2 O 3 , MnO and ZnO.…”

“…In addition, Sn-substituted MnZn ferrites were investigated by Das et al [10] to improve the microstructure and magnetic property. Sun et al [7,9] investigated the influences of SnO 2 additive on the microstructure and magnetic properties, such as hysteresis loss (P h ), eddy current loss (P e ) and residual loss (P r ), of MnZn ferrites at 1 MHz, 30 mT and 3 MHz, 10 mT, respectively. And the effects of Sn substitution on the microstructure, initial permeability, saturation magnetization at room temperature and Curie temperature of MnZn ferrites were studied by Das et al [10].…”

Analysis of losses in NiO doped MnZn ferrites

“…Recently, various additions, like CaO, SiO 2 , TiO 2 , SnO 2 and Nb 2 O 5 , have been reported to obtain more uniform microstructure, higher electrical resistivity (ρ), and lower losses (P L ) [4][5][6][7][8][9]. The influences of NiO in the formula system on the structural and magnetic properties of MnZn ferrite have been investigated in Ref.…”