کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9761797 | 1498428 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxygen vacancy formation and defect structure of Cu-doped lanthanum chromite LaCr0.79Cu0.05Al0.16O3âδ
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
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چکیده انگلیسی
The results of oxygen nonstoichiometry are presented for the chromite LaCr0.79Cu0.05Al0.16O3âδ with hexagonal perovskite structure at 1000 °C. The modeling of the defect structure of this oxygen deficient chromite is carried out by considering also the acceptor dopant Cu on B-site. The equilibrium constants, necessary to calculate all a priori unknown equilibrium defect concentrations, are determined by fitting the derived model equation to the measured oxygen nonstoichiometry. The three oxidation states 3+, 2+, and 1+ for copper are considered simultaneously in Cu-doped lanthanum chromite in addition to 3+ and 4+ states for chromium in the host lattice. The results of the fitting revealed that there is no significant change of the Cr3+ oxidation state over the complete oxygen partial pressure range investigated (â20â¤log(pO2/atm)â¤0). In contrast to this, copper changes its oxidation state continuously from 3+ via 2+ to 1+ if the oxygen partial pressure decreases thereby giving rise to oxygen vacancy formation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 3â4, 31 January 2005, Pages 417-421
Journal: Solid State Ionics - Volume 176, Issues 3â4, 31 January 2005, Pages 417-421
نویسندگان
A. Zuev, L. Singheiser, K. Hilpert,