Doping of CaFe0.5Mn0.5O3-δ with the rare earth element Sm to modulate the porous structure and oxygen vacancies to enhance microwave absorption

In this study, it is reported for the first time that porous Sm-doped CaFe0.5Mn0.5O3-delta (CFMO) has good microwave absorption properties. In this paper, SmxCa1-xFe0.5Mn0.5O3-delta (x = 0,0.05, 0.1, 0.15, 0.2) (Sm-CFMO) sample powders were prepared by the sol-gel method after calcination at 750 degrees C. Sm-CFMO was char-acterized using XRD, SEM, TEM, XPS and VSM, and mixed with paraffin wax for VNA testing. The addition of Sm elements increased the porous structure of CFMO, increased interfacial polarization and defect polar-ization, and increased oxygen vacancy content, resulting in enhanced charge polarization and dipole po-larization, while greatly optimizing the impedance matching of CFMO, and the compounding with paraffin wax also increased the composite with paraffin also increases the interfacial polarization capacity of the material, thus improving the microwave absorption performance of the sample. Moreover, as a new type of absorbing material, this material has great potential for development in the field of absorbing materials and provides a new direction for the development of absorbing materials in the future. (c) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study reports for the first time that porous Sm-doped CaFe0.5Mn0.5O3-delta (CFMO) exhibits excellent microwave absorption properties. By adding Sm elements, the porous structure, interfacial polarization, and defect polarization of CFMO are increased, along with the oxygen vacancy content, leading to enhanced charge polarization and dipole polarization. The combination with paraffin wax further enhances the interfacial polarization capacity, thereby improving the microwave absorption performance of the sample. This research holds great significance for the development of absorbing materials.