کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1294173 1498311 2012 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrical conductivity relaxation of polycrystalline PrBaCo2O5 + δ thin films
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Electrical conductivity relaxation of polycrystalline PrBaCo2O5 + δ thin films
چکیده انگلیسی

Thin films of PrBaCo2O5 + δ (PBCO) were prepared on SrTiO3 substrates by spray pyrolysis. Electrical conductivity relaxation was performed to measure the surface exchange coefficient, kchem, from 650 to 850 K, in the pO2 range 0.05–100% at a total pressure of 1 atm. The measured values fell in the range from 3.4 × 10− 9 cm/s to 8.6 × 10− 7 cm/s, with an activation energy of 1.30 eV. These values are significantly lower, and the activation energy higher, than previous reports. This discrepancy, and the discrepancies between prior reports in the literature, are attributed to surface composition. The film samples used in this study are shown to be enriched in (Pr + Ba) when compared with the bulk composition.


► PrBaCo2O5 + δ thin films are prepared by spray pyrolysis.
► Surface exchange rates are significantly lower than previously reported values.
► Films show significant surface enrichment of (Pr + Ba).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 228, 30 November 2012, Pages 14–18
نویسندگان
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