The influence of grain boundary internal stress on permeability: temperature curve for Mn-Zn ferrites
Abstract
The oxygen partial pressure ( PO 2) utilized in homogenization or cooling stage of sintering process has been observed to significantly influence the initial permeability-temperature ( μi- T) characteristics of the materials. Higher oxygen partial pressure ( PO 2) during homogenization period lowers the μi-value without shifting the secondary maximum peak ( Tsmp). However, higher PO 2 (0.1%) during cooling period shifts the Tsmp toward lower-temperature regime. This phenomenon is accounted for by the induction of compressive stress onto the ferrite grains, which in turn, is due to preferential oxidation along grain boundaries.
- Publication:
-
Journal of Magnetism and Magnetic Materials
- Pub Date:
- January 2000
- DOI:
- 10.1016/S0304-8853(99)00685-X
- Bibcode:
- 2000JMMM..209..193C