کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1298370 1498408 2006 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrochemical oxidation and reduction of the La0.2Sr0.8CoO3−δ phases: Control of itinerant ferromagnetism and magnetoresistance
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electrochemical oxidation and reduction of the La0.2Sr0.8CoO3−δ phases: Control of itinerant ferromagnetism and magnetoresistance
چکیده انگلیسی

In order to understand how the magnetotransport properties are related to the oxygen content, the La0.2Sr0.8CoO3−δ perovskite phases have been studied by using electrochemical cycling. The samples, prepared by a sol–gel technique, have been characterized from a structural and chemical point of view concomitantly to their physical properties. Upon reduction, a brownmillerite-type phase La0.2Sr0.8CoO2.65, which presents a weak ferromagnet behavior, is formed and, upon oxidation, a complete stoichiometric phase with a cubic unit cell (a = 3.83Å) could be obtained with a ferromagnetic and metallic behavior. Finally, it is shown that using appropriate cut-off potential upon reduction or oxidation the oxygen content and the cobalt valence can be monitored in such transition metal oxides to reach the fully oxidized or reduced end-members.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 177, Issues 9–10, 31 March 2006, Pages 815–820
نویسندگان
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