Abstract
The study of electrical properties of composite ceramics based on lithium ferrite LiFe5O8 with the addition of ZrO2 (1 and 2 wt%) was carried out. The samples were prepared by standard ceramic technology. Synthesis of lithium ferrite was conducted at 800°C for 120 minutes. The zirconium dioxide was added to synthesized powder by mixing in planetary ball mill, and then the composite powders were sintered at temperatures of 1100°C and 1050°C. The electrical conductivity of the samples was studied using two-probe spreading resistance method. It was found that addition of ZrO2 and an increase of its up to 2 wt% leads to increase in the activation energy and electrical resistivity.
Highlights
Lithium ferrite (LiFe5O8) is widespread as the microwave ferrite material
It can be seen that the curves for electrical conductivity current versus temperature are characterized by linear dependence in logarithmic coordinates for all lithium ferrite samples
The presented data show that the samples are characterized by the high values of the electrical resistivity, which is typical for lithium ferrite
Summary
Lithium ferrite (LiFe5O8) is widespread as the microwave ferrite material. The high Curie temperature (above 600°C) and saturation magnetization (about 3600 G) allowed to create a number of substituted lithium ferrites, which have been used in various microwave and high frequency devices [1,2]. The addition of ZrO2 during high temperature sintering improves the mechanical properties of nickel ferrite, such as a bending strength, microhardness and fracture toughness [16]. The influence of ZrO2 addition (1 and 2 wt%) on the electrical conductivity of LiFe5O8 lithium ferrite was studied. 2. Experimental Lithium ferrite samples were prepared by standard ceramic technology.
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