Journal of Sol-Gel Science and Technology (2021) 98:238–251 https://doi.org/10.1007/s10971-021-05502-4 ORIGINAL PAPER: SOL – GEL AND HYBRID MATERIALS WITH SURFACE MODIFICATION FOR APPLICATIONS Structural, dielectric, and magnetic properties of LaCo 0.2 Mn 0.8 O 3 and La 2 CoMnO 6 perovskite materials N. M. Yousif 1 ● N. Makram 2 ● L. A. Wahab 1 Received: 4 August 2020 / Accepted: 9 February 2021 / Published online: 8 March 2021 © The Author(s), under exclusive licence to Springer Science+Business Media, LLC part of Springer Nature 2021 Abstract Herein report, we aim to study the structural, dielectric, and magnetic properties for multifunctional perovskite materials LaCo 0.2 Mn 0.8 O 3 and La 2 CoMnO 6 nanoparticles, which were synthesized by a modified sol–gel route. Citric acid was processed as the chelating agent; gelation slurry formed by irradiation process which exposed to a total gamma radiation dose of 25 kGy at a dose rate of ~1.2 Gy/h to obtain more stability and high purity multifunctional perovskite materials. XRD notarizes the genesis of one pure phase orthorhombic perovskite structure. A full agreement between the particle sizes was investigated by HRTEM and the XRD data was observed. Raman spectra result assigned to the antisymmetric stretching mode and symmetric stretching mode of the (Co/Mn) O 6 octahedra, which related to lattice distortions. The as-prepared perovskite materials exhibit ferromagnetic nature with different values of magnetization. Electron Spin Resonance (ESR) measurements are also carried out in the LCMO multifunctional nanoparticle systems, which suggests the occurrence of Jahn–Teller glass analogous to the spin-glass behavior. The complex impedance displayed high impacts on the electrical properties. The high value of dielectric constant for LCMO prepared nanoparticle systems may be used in electric tunable devices. * N. M. Yousif yousif_nashwa@yahoo.com 1 Solid-State and Accelerators Department, National Center for Radiation Research & Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt 2 Nano-Materials Laboratory, Physics Department, Faculty of Science, Al-Azhar University, Cairo, Egypt 1234567890();,: 1234567890();,: