Abstract
The effect of the particle size to magnetic properties of the SrZn2W - type ferrite (SrZn2Fe16O27) prepared by the Spark Plasma Sintering (SPS) method were investigated. SrZn2W - type ferrite powders with average particle sizesof 0.77, 0.54 and 0.45 µm were prepared by ball-milling for 3, 7, 10.5 hours. The SrZn2W - type ferrite powders were sintered by the SPS at 1073 − 1223 K for 0 − 30 min as holding time. The SEM observation showed that the domain size of the spark-plasma-sintered SrZn2W - type ferrite was maintained as the initial particle size. As the particle size became smaller, the spark-plasma-sintered SrZn2W - type ferrite showed larger coercivity. Compared to the SrZn2W - type ferrite prepared at 1523 K by the conventional solid reaction method, the spark-plasma-sintered ferrite had larger resonance magnetization and coercivity. These facts show that the SPS method is effective for the low-temperature sintering and improving the coercivity of the W type ferrite.
