Gangwar, Bhanu P.Bhanu P.GangwarIrusta, SilviaSilviaIrustaSharma, SudhanshuSudhanshuSharma2025-08-312025-08-312020-07-0710.1002/slct.2019044352-s2.0-85087498227https://d8.irins.org/handle/IITG2025/24089La<inf>2-2x</inf>Bi<inf>2x</inf>O<inf>3</inf> (x=0-0.04) nanocrystalline powders are synthesized by one-pot single step solution combustion method. 4 atom% Bi doped La<inf>2</inf>O<inf>3</inf> reveals the presence of both Bi<sup>3+</sup> and metallic Bi. Temperature programmed reduction (TPR) of La<inf>2</inf>O<inf>3</inf> and La<inf>2−2x</inf>Bi<inf>2x</inf>O<inf>3</inf> (x=0.005-0.04) indicates that the oxygen storage capacity changes with the dopant (Bi) concentration. La<inf>2-2x</inf>Bi<inf>2x</inf>O<inf>3</inf> (x=0.04) has less hygroscopic behavior compared to La<inf>2</inf>O<inf>3</inf> and shown enhanced stability in an open atmosphere. The direct band gap of La<inf>2</inf>O<inf>3</inf> and La(OH)<inf>3</inf> decreases significantly after Bi doping. Further, PL studies of Bi doped compounds show a blue emission at 458 nm due to <sup>3</sup>P<inf>1</inf> - <sup>1</sup>S<inf>0</inf> transition of the Bi<sup>3+</sup> ion substituted in La<inf>2</inf>O<inf>3</inf>. Emission intensity is maximum with 0.5 atom percent Bi doping, which decreases gradually with increasing Bi<sup>3+</sup> ion concentration. Bi doping also modifies the catalytic activity of La<inf>2</inf>O<inf>3,</inf> resulting in higher CO oxidation activity than unsubstituted La<inf>2</inf>O<inf>3</inf>.falseBi doped lanthanum oxide | doping | heterogeneous catalysis | photoluminescence | solution combustionEffect of Bi3+ Ion Concentration on Physicochemical, Optical and Catalytic Properties of One-Pot Combustion Synthesized Nanocrystalline Bi-Doped La2O3Article236565497548-75597 July 20204arJournal1WOS:000545756700031