Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5438602 | Ceramics International | 2017 | 15 Pages |
Abstract
The present study investigates electromagnetic properties, as well as microstructural and thermal stability, of low temperature fired MgCuZn ferrite with the addition of various amounts of Bi2O3. To achieve better performance at low sintering temperature, ceramic specimens were fabricated using nano-sized precursor powders through the nitrate-citrate auto-combustion method. X-ray diffraction study shows the formation of single phase spinel structure without any impurity phases. Compared with the additive-free sample, the addition of Bi2O3 increases the density of all specimens. Scanning electron microscopy micrographs of samples indicate that Bi2O3 content significantly affects densification through grain growth promotion. Excessive amounts of Bi2O3, however, lead to abnormal grain growth. Moreover, the sample with 0.25Â wt% Bi2O3 shows the highest density and grain shape uniformity as well as the lowest porosity. Dynamic magnetic properties were studied in a frequency range of 1-90Â MHz, using an impedance analyzer. Results reveal that the sample with a low amount of additive (0.25Â wt%) has the highest saturation magnetization, initial permeability (at 1Â MHz), and quality factor, whereas it's Curie temperature slightly decreases. With the further increase of Bi2O3 content, however, the initial permeability and saturation magnetization of samples deteriorate gradually.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Hamed Bahiraei, C.K. Ong,