نتایج جستجو برای: lacoo3
تعداد نتایج: 204 فیلتر نتایج به سال:
NO+H2+O2 reactions: comparison between Pd/Al2O3 and Pd/LaCoO3 catalysts C. Dujardin, J.P. Dacquin, P. Miquel, S. Cristol, S. Nikitenko, W. Bras, P. Granger 1 Unité de Catalyse et de Chimie de Solide, UMR 8181, Université des Sciences et Technologies de Lille, Bâtiment C3, 59655 – Villeneuve d’Ascq, France 2 DUBBLE, ESRF Grenoble, 6 rue Jules Horowitz, BP220, 38043 Grenoble, France * Correspondi...
Strict environmental regulations on air quality coupled with a consumer desire for more efficient engines has forced the automotive industry to start developing more advanced emissions aftertreatment technologies. Of the common diesel exhaust treatment methods for NOx removal, Lean NOx Traps (LNT) have been recognized as the most practical for use in small displacement engines. The current stat...
Oxygen vacancies in perovskite oxides are of great interest both from fundamental viewpoint due to their effect on electronic and magnetic properties of oxides – and from applications viewpoint due to their importance for solid oxide fuel cells. In the latter case, understanding the dynamic behavior of vacancies is crucial. Oxygen vacancy (Vo) ordering can substantially affect local structure a...
This research study examines the high-temperature dielectric relaxation and electric conduction mechanisms in (x)LaCoO3-(1 – x)Na0.5Bi0.5TiO3 samples, where x is 0.05, 0.10, 0.15. The findings demonstrate that all samples exhibit two transitions: first, a frequency-dispersive shoulder at lower temperature (Ts) around 425–450 K, which associated with polar nanoregions (PNRs), second, from ferroe...
Ferromagnetic insulators are required for many new magnetic devices, such as dissipationless quantum-spintronic devices, magnetic tunneling junctions, etc. Ferromagnetic insulators with a high Curie temperature and a high-symmetry structure are critical integration with common single-crystalline oxide films or substrates. So far, the commonly used ferromagnetic insulators mostly possess low-sym...
Resonant photoemission of single crystals of the double perovskites GdBaCo2O5+d and DyBaCo2O5+d has been carried out at the UK Synchrotron Radiation Source at Daresbury. The resonance onset energy at the Co 3p→3d threshold is used to explore the Co spin state in the double perovskites as a function of temperature. In contrast with the simple perovskites LaCoO3 and HoCoO3, an undelayed resonance...
در این بررسی پروسکایت های lacoo3 به روش سیترات و نوع پایه دار آن با تلقیح محلول نیترات های کبالت و لانتانیم روی پایه های سیلیکا و آلومینا تهیه شد. همچنین از پایدارکننده های سریا،زیرکونیا و لانتانا برای کاهش اثرات متقابل پروسکایت و پایه استفاده گردید. عملکرد این کاتالیست ها درc°750-100 ودر حضور گازی شبیه گاز خروجی از اگزوز خودروهای بنزینی بررسی شد. کاتالیست بدون پایه lacoo3 ، co را در دماهای کمت...
Metal-oxygen bonding of the Ce-doped LaCoO3 system remains largely unexplored despite extensive studies on its magnetic properties. Here, we investigate structure and local nanoscale La1−xCexCoO3, with x = 0, 0.2, 0.4, using Rietveld refinement synchrotron X-ray absorption techniques, complemented by topological analysis experimental electron density energy distribution. The results show that s...
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