Szczegóły publikacji
Opis bibliograficzny
Structural and transport properties of $La_{1-x}Sr_{x}Co_{1-y-z}Fe_{y}Ni_{z}O_{3-\delta}$ perovskites / K. ŚWIERCZEK, J. MARZEC, W. OJCZYK, J. MOLENDA // Diffusion and Defect Data – Solid State Data. Part A, Defect and Diffusion Forum ; ISSN 1012-0386. — 2005 — vols. 237–240, Pt. 2, s. 1293–1298. — Bibliogr. s. 1298, Abstr. — Publikacja dostępna online od: 2005-04-30. — DIMAT 2004 : Diffusion in Materials : proceedings of the 6th international conference on Diffusion in Materials : Cracow, Poland, July 18–23, 2004 / eds. M. Danielewski [et al.]. — Uetikon-Zuerich, Switzerland : TTP Trans Tech Publications Ltd., 2005
Autorzy (4)
Słowa kluczowe
Dane bibliometryczne
| ID BaDAP | 22375 |
|---|---|
| Data dodania do BaDAP | 2005-05-23 |
| Tekst źródłowy | URL |
| DOI | 10.4028/www.scientific.net/DDF.237-240.1293 |
| Rok publikacji | 2005 |
| Typ publikacji | referat w czasopiśmie |
| Otwarty dostęp |  |
| Czasopismo/seria | Diffusion and Defect Data. Solid State Data, Part A, Defect and Diffusion Forum |
Abstract
The La(1-x)Sr(x)Co(0.2)Fe(0.6)Ni(0.2)O(3-delta), La(1-x)Sr(x)Co(0.4)Fe(0.4)Ni(0.2)O(3-delta) and La(1-x)Sr(x)Co(0.2)Fe(0.4)Ni(0.4)O(3-delta) perovskites were synthesized with Sr contents 0.1 <= x <= 0.3 using precursors obtained by citric acid method and their structural and transport properties were measured. All obtained samples crystallize in hexagonal R-3c perovskite structure. The thermal stability was found to decrease with increasing Ni and Sr amounts, what leads to appearance of La(2)NiO(4) like secondary phases with spinel structure and even NiO for higher Ni concentration. The DC electrical conductivity and thermoelectric power measurements at low temperatures (77 - 300K) suggest an appearance of variable hopping mechanism in this temperature range. The transport properties were found to improve with both Sr and Ni concentration increases. The moessbauer spectroscopy studies of La(1-x)Sr(x)Co(0.2)Fe(0.6)Ni(0.2)O(3-delta) samples revealed presence of two valence states of iron (Fe(2+), Fe(3+)). The measured high temperature (870 - 1070K) DC electrical conductivity is relatively high for samples with high Sr and Ni amounts, what makes them good candidates for a possible application as cathode materials for Intermediate Temperature Solid Oxide Fuel Cells and points to further studies of perovskites from the (La, Sr)(Co, Fe, Ni)O(3) system.
