Room Temperature Structural and Electrical Studies on Jahn-Teller Distortions Signal Induced by Cr and Co Doping in Pr0.75Na0.2Ag0.05Mn1-xMxO3 Perovskite Manganites
Corresponding author: Suhadir Shamsuddin
Abstract
In this study, Pr0.75Na0.2Ag0.05Mn1-xMxO3 (M=Cr, Co) (x = 0, 0.02, and 0.05) samples were synthesized via the standard solid-state method with magnetic ion (Cr, Co) doping. The study aimed to investigate the crystalline phase, surface morphology, and resistivity, addressing the lack of experimental data related to Jahn-Teller (JT) distortion in such systems. Structural, morphological, and electrical characterizations were performed using X-ray Diffraction (XRD), Scanning Electron Microscopy with Energy-Dispersive X-ray (SEM-EDX) spectroscopy, Fourier Transform Infrared Spectroscopy (FTIR), and four-point probe measurements. All samples crystallized in an orthorhombic structure with a Pnma space group, with lattice parameters decreasing as Cr and Co doping concentrations increased. SEM observations revealed that grain boundaries became more compact, accompanied by a reduction in grain size. FTIR spectra confirmed Mn–O stretching vibrations at 703 cm–1, 711 cm–1, 714 cm–1, 726 cm–1, and 727 cm–1 for Pr-1, Pr-2, Pr-3, Pr-4, and Pr-5, respectively. Resistivity measurements showed a decrease with doping, attributed to the reduced interaction distance between atoms. Overall, minor Cr and Co substitutions appear to weaken the JT distortion by replacing Mn3+ ions, as supported by the experimental findings.
Keywords:
doping induced, Jahn-Teller distortion, perovskite manganiteDownloads
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Copyright (c) 2025 Wen Lin Teo, Suhadir Shamsuddin, Saifful Kamaluddin Muzakir, Mirza Basyir Rodhuan
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