Electrical transport mechanisms of Neodymium-doped rare-earth semiconductors

Vaz, Isabela Cristina Fernandes; Macchi, C.; Somoza, A.; Rocha, L. S. R.; Longo, Elson; Cabral, L.; Silva, E. Z. da; Simões, Alexandre Zirpoli; Zonta, Giulia; Malagù, C.; Desimone, Paula Mariela; Ponce, Miguel Adolfo; Moura, F.

doi:10.1007/s10854-022-08098-9

Cited by 6 publications

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“…The formation of clusters of pure ceria is represented in Figure a. The scheme proposes the possibilities of interaction between the clusters that generate neutral systems as well as dipoles and quadrupoles. − As already mentioned, such an oxidized configuration is a consequence of the presence of a high concentration of O defects in the MnO y –CeO x solid solutions . On the contrary, Ce 3+ and Mn 2+ cations are also responsible for reducing the vacancies from V o • to V o x or V o •• to V o x , as illustrated in Figure b.…”

Section: Resultsmentioning

confidence: 97%

Manganese Defective Clustering: Influence on the Spectroscopic Features of Ceria-Based Nanomaterials

et al. 2023

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The influence of manganese modification on the spectroscopic features of manganese-doped CeO 2 systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective structures were verified, focusing on their interaction with poisonous atmospheres. Raman and electron paramagnetic resonance studies confirmed the presence of defective clusters formed by dipoles and/or quadrupoles. The number of paramagnetic species was found to be inversely proportional to the doping concentration, resulting in an increase in the Mn 2+ signal, likely due to the reduction of Mn 3+ species after the interaction with CO. X-ray photoelectron spectroscopy data showed the pure system with 33% of its cerium species in the Ce 3+ configuration, with an abrupt decrease to 19%, after the first modification with Mn, suggesting that 14% of the Ce 3+ species are donating one electron to the Mn 2+ ions, thus becoming nonparamagnetic Ce 4+ species. On the contrary, 58% of the manganese species remain in the Mn 2+ configuration with five unpaired electrons, corroborating the paramagnetic feature of the samples seen in the electron paramagnetic resonance study.

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