a University Institute of Radiological Sciences and Medical Imaging Technology,

The University of Lahore, Lahore Pakistan

^bInstitute of Physics, The Islamia university of Bahawalpur, Pakistan

c Department of Physics, the University of Lahore, Lahore Pakistan.

d Department of DNA and Serology, Punjab Forensic Science Agency, Lahore

Pakistan

^eDepartment of Physics, Hazara University Mansehra, kpk, Pakistan

^fDepartment of Physics, Faculty of Science, Islamic University of Madinah,

Madinah, 42351, Saudi Arabia

^gDepartment of Chemistry, Turabah University College, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia

h Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key

Laboratory for Carbon-Based Functional Materials & Devices, Soochow

University, Suzhou, People’s Republic of China

The R-type hexagonal ferrites sr1-x crxzn2Fe4011 based on Sr2+with configuration (x =

0.0, 0.02, 0.06, 0.1) were synthesized using the sol-gel method and sintered at 1173 K. X-

ray diffraction (XRD) analysis confirmed the formation of single-phase R-type hexagonal ferrites. The substitution of Cr2+ affected various properties, including the lattice parameters (a (Å), c (Å)), crystallite size (nm), X-ray density (g/cm³), and unit cell volume (V (ų)). The crystallite size of all the samples ranged from 24 nm to 37 nm. Fourier transform infrared (FTIR) spectra exhibited bands between 400 cm⁻¹ and 480 cm⁻¹ . The dielectric constant increased with Cr2+ substitution but decreased with increasing frequency. AC conductivity also increased as frequency rose. These materials are suggested for use in microwave absorption applications and transformers, as they could help enhance performance by minimizing eddy currents.