Due to the different manufacturing materials, ferrite magnets are mainly divided into strontium ferrite (SrO.6Fe2O3) and barium ferrite (BaO.6Fe2O3), which is more widely used strontium ferrite magnets, today to introduce the performance differences between these two kinds of ferrite.
For barium ferrite and strontium ferrite, the main performance differences are as follows.
1. The saturation magnetization strength is different. Strontium ferrite saturation magnetization strength of about 1.35 T, higher than barium ferrite about 1.1 T. This is because the strontium atomic radius is larger, so that the ferrous ion spacing increases, reducing the antimagnetic exchange of ferrous ions, which is conducive to improving the saturation magnetization strength.
2. Different anisotropy constants. The anisotropy constant of barium ferrite is about 4.5×105 J/m3, which is larger than that of strontium ferrite (2.7×105 J/m3), and the larger anisotropy constant means that it is more difficult to change the direction of magnetization, so barium ferrite is more anisotropic.
3. Different phase transition temperatures. The phase transition temperature of barium ferrite is about 130 K, while that of strontium ferrite is about 250 K. Strontium ferrite has a higher phase transition temperature and can be used in a wider range of applications.
4. Different resistivity. The resistivity of strontium ferrite is about 10-5 Ω-m, lower than that of barium ferrite 10-3 Ω-m, so strontium ferrite has better conductivity.
5. Price difference. Because of strontium resources than barium rich, strontium ferrite price is lower than barium ferrite, which is strontium ferrite is more widely used for an important reason.
Overall, strontium ferrite typically exhibits stronger properties in terms of magnetism, which makes it potentially more attractive for some magnetic applications. However, it should be noted that the specific properties are also affected by the preparation conditions of the material, temperature, pressure, and other factors .
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