TAILIEUCHUNG - Ferroelectrics Characterization and Modeling Part 9

Tham khảo tài liệu 'ferroelectrics characterization and modeling part 9', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 270 Ferroelectrics - Characterization and Modeling valance state and distributed randomly over the crystallographic equivalent lattice sites. The resistivity of the composite is the sum of the resistivities of their constituents 14 and the decrease in resistivity with increase in temperature is attributed to the increase in drift mobility of charge carriers. During the process of preparation the formation of Fe2 and Fe3 ions depends on the sintering condition. But large drop in resistivity is observed on the addition of a ferrite phase to the composites it is due to the partial reduction of Fe2 and Fe3 ions at elevated firing temperatures. While preparing the mixtures of two phases to get high ME response in the composites the control of the resistivity of the ferrite phase is necessary compared to ferroelectric phase. Similar results have been identified in the temperature dependent resistivity plot for the x Fe2O4 1-x Pb composites with x and 15. The variation of DC electrical resistivity with temperature for x Fe2O4 1-x composites with x and is also presented earlier 16. The resistivity of the composites decreases with increase in ferrite content and the increase in resistivity with temperature is due to the increase in drift mobility of the charge carriers. However the conduction in ferrite may be due to the hopping of electron from Fe2 and Fe3 ions. The number of such ion pairs depends upon the sintering conditions and which accounts for the reduction of Fe3 to Fe2 at elevated temperatures. That is the resistivity of ferrite is controlled by the Fe2 concentration on the B-site. In Ni-ferrite Ni ions enter the lattice in combination with Fe3 ions resulting in a lower concentration of Fe2 ions with higher resistivity and which is one of the prime requirements for getting higher values of ME output. According to theoretical predictions the plots of .

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