Influence of doping concentrations on the structural, optical, and magnetic properties of Ba-doped LaCoO 3 nanostructure

• Published in: Zeitschrift für physikalische Chemie (Neue Folge)
• Main Authors: Sahadevan, Jhelai, Madavan, Mugesh, Sankaran, Esakki Muthu, Kim, Ikhyun, Venkatesan, Rajesh, Alharbi, Naiyf S., Khaled, Jamal M., Paramasivam, Sivaprakash
• Format: Journal Article
• Language: English
• Published: 12.03.2024
• ISSN: 0942-9352; 2196-7156
• DOI: 10.1515/zpch-2024-0600

Abstract In this article we report the structural, morphology, vibrational, optical and magnetic properties of Ba x La 1− x CoO 3 ( x  = 0, 0.05, and 0.1) (LBCO) samples. The X-ray diffraction shows that samples are in single rhombohedral phase. The Raman signals of LCO were quite small in comparison to LBCO, which exhibited a Raman peak above 675 cm −1 . The band seen with a wavenumber of 484 cm −1 corresponds to the vibrational modes of E g bending and Ba–O stretching. UV–DRS and photoluminescence spectra indicated broad absorption over the ultraviolet, visible, and near-infrared spectrums. Surface morphology and EDAX spectra corroborated the materials homogeneous size distribution and homogenous microstructure, with Ba indicating a more stable structure. XPS was used to study chemical states of LBCO and found Co (2p), La (3d), O (1s), and C (1s) elements in perovskite compounds. A peak beneath 300 eV indicated adventitious carbon on surface materials. XPS survey spectrum elements La, Ba, Co, and O had their own binding energies. The magnetization-field dependency of LBCO at 300 K showed that Ba insertion into the LCO switched it from paramagnetic to weak ferromagnetic. Ba considerably decreased magnetic saturation and coercivity, influencing magneto-crystallites’ anisotropy and coercive field.