Szczegóły publikacji
Opis bibliograficzny
Unveiling new, unique structural and transport effects in Cu-doped $(La_{0.2}Sr_{0.8})_{1-x}TiO_{3}$ system / Jan ADAMCZYK, Juliusz DĄBROWA, Marek ZAJUSZ, Ewa DROŻDŻ // Journal of Alloys and Compounds ; ISSN 0925-8388 . — 2025 — vol. 1040 art. no. 183669, s. 1-13. — Bibliogr. s. 12-13, Abstr. — Publikacja dostępna online od: 2025-09-10
Autorzy (4)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 162632 |
|---|---|
| Data dodania do BaDAP | 2025-09-18 |
| Tekst źródłowy | URL |
| DOI | 10.1016/j.jallcom.2025.183669 |
| Rok publikacji | 2025 |
| Typ publikacji | artykuł w czasopiśmie |
| Otwarty dostęp |  |
| Creative Commons | |
| Czasopismo/seria | Journal of Alloys and Compounds |
Abstract
Lanthanum strontium titanates represent a promising perovskite system, which is constantly being developed to further optimize its properties. In this work, the series of Cu-doped materials with the assumed formula (La0.2Sr0.8)1-xTiO3 (x = 1.0/0.9/0.8) is synthesized using the modified sol-gel method and the impact of copper doping, A-site non-stoichiometry and sintering temperature on structural, microstructural and electrical properties is investigated. Temperature-programmed reduction (TPR) profiles clearly show that copper is successfully incorporated into titanium sublattice for LS1.0TCu, while for non-stoichiometric samples, Cu is located mainly in secondary phases including CuO and very unusual Im-3 (La,Sr)Cu3Ti4O12 structure for LS0.9TCu and LS0.8TCu respectively. The structural analysis of the pellets after TPR measurements indicates the presence of metallic copper on the surface of the samples, implying the occurrence of the exsolution process. All materials exhibit typical semiconducting behavior in air with relatively low total conductivity values that increase significantly in hydrogen. Noteworthy, a very unique transition from semiconducting behavior in air to metallic-like one under reducing atmosphere is observed, exclusively for the A-site deficient materials. The introduction of A-site deficiency improves transport properties and sinterability, however, exceeding its level beyond 10 % is suboptimal. The presence of Cu permanently incorporated into the perovskite structure of LS1.0TCu material results in full reversibility of the reduction-oxidation and electrical properties (in H2-rich/O2-rich atmospheres), which predispose it to use in electrocatalytic systems. In the case of non-stoichiometric LS0.9TCu, higher conductivity values and a change in the conductivity mechanism depending on the atmosphere of the material’s operation give hope for its application in fuel cell technology.
