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In-depthstudy of the Chromite Compound LaNdSrAgCrO Structure, Dielectricity, Magnetic and Technological Application RecentAdvances
Authors: Issaoui, H.; Brahmi, M.; Issaoui, F.; Dhahri, E.; Costa, BFO; Nogueira, BA; Fausto, R.
Ref.: J. Supercond. Novel Magn. 39(5), 155 (2026)
Abstract: This work investigates the structural, magnetic, electrical, and dielectric properties of the multi-element A-site substituted perovskite La-0.Nd-5(7)0.Sr-1(0)0.Ag-1(8)0.15CrO3 (LNSACrO) synthesized by the sol-gel method. X-ray diffraction and Rietveld refinement confirm a rhombohedral structure with the R-3c space group. Raman and SEM analyses reveal lattice distortion and a polycrystalline microstructure. Magnetic measurements performed under 0.05 T show a complex magnetic behavior, with an antiferromagnetic transition at TN = 12 K and a ferromagnetic-paramagnetic transition at TC = 275 K, highlighting the influence of multi-cation A-site substitution on the magnetic ordering. Electrical measurements reveal thermally activated conduction with an activation energy of 0.280 eV, while the temperature dependence of the Jonscher exponent indicates a correlated barrier hopping (CBH) mechanism. Impedance analysis confirms non-Debye relaxation and distinct grain and grain-boundary contributions. These results demonstrate the strong coupling between A-site chemical disorder and the magnetic and electrical properties of LNSACrO, highlighting its potential for multifunctional magneto-dielectric and electronic applications.
