## 4 Conclusions  
After summarizing the experimental results obtained from [Cu\({}_{\rm x}\)Zn\({}_{1-\rm x}\)]Fe\({}_{2}\)O\({}_{4}\) and [Ni\({}_{\rm x}\)Zn\({}_{1-\rm x}\)]Fe\({}_{2}\)O\({}_{4}\), the following conclusions can be obtained: for different compositions of Cu-Zn and Ni-Zn ferrites, the sintering temperatures for optimal saturated magnetization values were quite different. For the [Cu\({}_{\rm x}\)Zn\({}_{1-\rm x}\)]Fe\({}_{2}\)O\({}_{4}\) system, the optimal sintering temperature was 900 \({}^{\circ}\)C, and the saturated magnetization was 60.19 M(emu/g). For the [Ni\({}_{\rm x}\)Zn\({}_{1-\rm x}\)]Fe\({}_{2}\)O\({}_{4}\) system, the optimal sintering temperature was also 900 \({}^{\circ}\)C, but the saturated magnetization was 91.40 M(emu/g). The material with the saturated magnetization most seriously affected by the sintering temperature was [Ni\({}_{\rm x}\)Zn\({}_{1-\rm x}\)]Fe\({}_{2}\)O\({}_{4}\), and the difference between the maximal and minimal values was 41.11 M(emu/g). However, for the [Cu\({}_{\rm x}\)Zn\({}_{1-\rm x}\)]Fe\({}_{2}\)O\({}_{4}\) system, the difference between the maximal and minimal value was 35.30 M(emu/g). The size of the remanent magnetization depended on the preparation conditions, and there was no relative relationship between the size of the saturated magnetization and the size of the remanent magnetization. Moreover, there was no relative relationship between the size of the saturated magnetization and the size of the coercive force. Both for Cu-Zn and Ni-Zn ferrites, the coercive force did not exceed 200 Oe; thus, both materials were  
Figure 8: The influence of cladding with TiO\({}_{2}\) on the magnetic properties of [Ni\({}_{\rm x}\)Zn\({}_{1-\rm x}\)]Fe\({}_{2}\)O\({}_{4}\).  
soft ferrites. From VSM and XRD results for the different compositions, it can be seen that, for all kinds of systems and all proportions, the sintering atmosphere and sintering temperature--before the drop of the saturated magnetization--indicated that the stronger the crystal phase strength, the stronger the saturated magnetization. For [Cu\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\) and [Ni\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\) ferrites at different sintering temperatures, the crystal phase strength of XRD was affected; the higher the sintering temperature, the stronger the crystal phase. For the material with a stronger crystal phase, SEM showed that the average particulate diameter was also larger, and when the sintering temperature was higher, the average particulate diameter was larger. It can be clearly seen from the SEM photos that, for non-sintered to sintered at 900 \({}^{\circ}\)C Cu-Zn and Ni-Zn ferrites, the one with the maximal change on the average particulate diameter due to sintering temperature was [Cu\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\), and the average particulate diameter changed from 10 nm to 150 nm; for the [Ni\({}_{x}\)Zn\({}_{1-x}\)]Fe\({}_{2}\)O\({}_{4}\) system, the average particulate diameter change was in the range of 10-50 nm.  
The financial support from the Ministry of Science and Technology under grant numbers MOST 105-2221-E-274-003 and MOST 106-2221-E-274-004 is gratefully acknowledged. [PERSON] conceived and designed the experiments; [PERSON] and [PERSON] performed the experiments; [PERSON] and [PERSON] analyzed the data; [PERSON] contributed reagents/materials/analysis tools; [PERSON] wrote the paper. The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.