Comparative study of reflection loss of microwave absorbing materials from single phase Co1-xZnxFe2O4 and CoFe2O4/LaFeO3 composites

• Main Authors: Johan, Akmal, Adi, Wisnu Ari, Arsyad, Fitri Suryani, Ramlan, R., Setiabudidaya, Dedi
• Format: Conference Proceeding
• Language: English
• Subjects: Cobalt ferrites; Comparative studies; Composition; Impedance measurement; Lanthanum compounds; Microwave absorbers; Microwave absorption; Zinc
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0171720

Reflection loss is a parameter that indicates the magnitude of the absorption of the material against the microwaves that hit it. However, it is usually influenced by intrinsic properties in the form of permeability and permittivity properties of the material, as well as extrinsic properties in the form of geometry and thickness factors of the material. The amount of absorption is the accumulation of both as a function of frequency. In this study, two types of test samples have been prepared, namely single-phase and composite samples. Single phase sample is system material Co1-xZnxFe2O4 with various compositions (x = 0, 0.25, 0.5, and 0.75), while the composite sample is a mixture of CoFe2O4/LaFeO3 with composition 70/30, 50/50, 30/70, and 15/85. The results of the impedance measurement of each sample show that the impedance significantly changes with the addition of Zn in the Co1-xZnxFe2O4 system. While the composite sample with several variations in composition does not significantly affect the value of the impedance. The results of the reflection loss (RL) measurement show that the sample with single phase has a change in absorption along with changes in composition (the presence of Zn substitution), but there is no significant change in the composite sample with changes in composition variations. It is concluded that the intrinsic properties of microwave absorbing materials can affect both the impedance and the reflection loss when in single phase. Thus, the importance of making materials as microwave absorbers starts from a system that has a single phase because it will be easy to control and understand its absorption characteristics.