Abstract
This paper presents the results of an investigation on the magnetic and dielectric properties of Mg0.5Zn0.5Fe2O4 spinel ferrite with a 1% weight percentage of Li+ and K+ added cations. The addition of metal ions plays an important role in increasing the porosity and favors the formation of ferrite at low temperatures. The goal of this new research is to demonstrate that by selecting the type of metallic cations for addition or choosing an optimal sintering temperature, it may be possible to improve the magnetic and electrical properties of Mg-Zn ferrite. The samples were prepared using sol-gel self-combustion techniques and annealed at 1000 °C, 1100 °C, and 1200 °C. Scanning electron microscopy revealed the shape and grain size of the samples, and the phase composition was analyzed using the X-ray diffraction technique. The magnetic information, such as remanent magnetization MR, saturation magnetization MS, and coercivity HC, were extracted from the hysteresis loops of the samples. The electrical investigation was focused on the low- and high-frequency dependence of dielectric constant and dielectric losses. The results are discussed in terms of microstructural changes induced by the additions of Li+ and K+ metallic cations. Conclusions are drawn concerning the optimization of magnetic and electrical properties for the development of Mg-Zn ferrite with possible applications in the field of magnetic materials or electronics.
Highlights
Accepted: 26 August 2021Ferrites based on Mg-Zn are important ceramic materials that present spinel-type lattices with soft magnetic properties.There isenhanced interest in these materials due to their chemical stability and low production costs for possible applications such as magnetic recording, electromagnets, hyperthermia treatment, antibacterial activity, humidity sensors, medicine, and inductive sensors and actuators working in a wide frequency range 102 to 109 Hz [1,2,3,4,5,6].The main inconvenience of spinel magnesium-based ceramic materials is their high annealing temperature, over 1300 ◦ C, which causes significant material loss and large energy consumption
We found that the addition of metal cations to the composition of magnesium-zinc ferrite involved a significant increase of coercivity for all samples
We show that porous Mg-Zn ferrite can be obtained at medium temperatures using the addition of alkaline metal cations
Summary
Accepted: 26 August 2021Ferrites based on Mg-Zn are important ceramic materials that present spinel-type lattices with soft magnetic properties.There isenhanced interest in these materials due to their chemical stability and low production costs for possible applications such as magnetic recording, electromagnets, hyperthermia treatment, antibacterial activity, humidity sensors, medicine, and inductive sensors and actuators working in a wide frequency range 102 to 109 Hz [1,2,3,4,5,6].The main inconvenience of spinel magnesium-based ceramic materials is their high annealing temperature, over 1300 ◦ C, which causes significant material loss and large energy consumption. Ferrites based on Mg-Zn are important ceramic materials that present spinel-type lattices with soft magnetic properties.There isenhanced interest in these materials due to their chemical stability and low production costs for possible applications such as magnetic recording, electromagnets, hyperthermia treatment, antibacterial activity, humidity sensors, medicine, and inductive sensors and actuators working in a wide frequency range 102 to 109 Hz [1,2,3,4,5,6]. Magnetic and dielectric properties of ferrites can be enhanced or altered by modifying various added metallic cations and the sintering temperature and/or time [7,8,9,10,11]. Magnetic and dielectric properties of spinel ferrites AB2 O4 are dependent on the distribution of A and B cations in tetrahedral or octahedral sites, respectively. The common conclusion of these works was that the temperature of synthesis influences the distribution of metal cations in the position of the spinel network
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