Influence of ruthenium doping on the crystal structure and magnetic properties of pr0.67 ba0.33 mn1–x rux o3 manganites

Abstract

This study reports the structural, morphological, and magnetic properties of ruthenium doping at the manganese site in Pr0.67 Ba0.33 MnO3 manganites. Rietveld refinement X-ray powder diffraction (XRD) data show that Pr0.67 Ba0.33 MnO3 and Pr0.67 Ba0.33 Mn0.9 Ru0.1 O3 crystallize in an orthorhombic perovskite structure with the Pnma space group. Doping with Ru yields an increment in the lattice parameter and unit cell volume. In addition, small changes in the Mn–O–Mn bond angle and bond distance are observed. Field emission scanning electron microscopy (FESEM) is used to examine the surface morphology of the samples. Fourier transform infrared spectroscopy (FTIR) reveals that the Mn–O and metal–oxygen bonds appear at the 600 and 900 cm−1 bands, respectively. The AC magnetic susceptibility measurement studies confirm that a paramagnetic (PM) to ferromagnetic (FM) transition exists at 130 and 153 K for the Pr0.67 Ba0.33 MnO3 and Pr0.67 Ba0.33 Mn0.9 Ru0.1 O3 samples, respectively.