کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1617450 1005687 2011 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of the oxygen content and the preparation method on the power factor of PrBaCo2O5+δ samples (0.54 ≤ δ ≤ 0.84)
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Influence of the oxygen content and the preparation method on the power factor of PrBaCo2O5+δ samples (0.54 ≤ δ ≤ 0.84)
چکیده انگلیسی

In this work, we focus on the influence of the oxygen content and the preparation method on the power factor of different PrBaCo2O5+δ samples (0.54 ≤ δ ≤ 0.84). The samples have been initially synthesized by the Pechini method. Their oxygen content has been subsequently modified by annealing under argon/oxygen flow or by electrochemical oxidation/reduction. The oxygen stoichiometry has a high impact on the electrical conductivity and Seebeck coefficient of the resulting materials. Moreover, by adequately reducing their oxygen content while increasing their intergrain conductivity (by increasing the particle size and degree of sintering) the power factor of these samples can be drastically improved. The best result is shown by the PrBaCo2O5.54 sample, that was annealed at high temperature under argon flow, whose power factor is as high as 6.5 μW/K2 cm−1 at ∼135 K, more than two orders of magnitude higher than that shown by the initial PrBaCo2O5.76 reference sample.

Research highlights
► Synthesis of single-phase materials with oxygen content between 5.54 and 5.84.
► Great influence of the oxygen content on the magnetic and transport properties.
► PrBaCo2O5.54 sample shows the highest value of the power factor.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 509, Issue 17, 28 April 2011, Pages 5250–5255
نویسندگان
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