کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1297401 973856 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Transport properties and in-situ Raman spectroscopy study of BaCe0.9Y0.1O3 − δ as a function of water partial pressures
موضوعات مرتبط
مهندسی و علوم پایه شیمی الکتروشیمی
پیش نمایش صفحه اول مقاله
Transport properties and in-situ Raman spectroscopy study of BaCe0.9Y0.1O3 − δ as a function of water partial pressures
چکیده انگلیسی

The total conductivity of BaCe0.9Y0.1O3 − δ material was measured under air, in a large p(H2O) range up to 0.30 bar. The defect concentrations (OHO·, VO· · and h·) and electrical conductivities were calculated on the basis of chemical constants (diffusion coefficients and equilibrium constants reported in the past literature) and compared to the experimental data. Protonic transport number as high as 0.8 was found at 700 °C, under air containing 0.30 bar of water, which allows a possible extension of the protonic temperature range of this material using water rich atmosphere. In-situ Raman spectroscopy under wet and dry air was performed from room temperature up to 700 °C in two wavenumber ranges. At low wavenumber, characteristic of lattice vibrations, this study clearly shows that no significant changes occur upon water insertion while at high wavenumbers, characteristic of OH vibrations, two contributions to the OH vibrations were found. This is discussed in terms of proton environment and transient hydrogen bonds. Moreover, this in situ study confirms that, at moderate p(H2O), water insertion becomes significant at temperature below 650 °C.

Research highlights
► BCY10 proton transport number explored on a large pH2O range (up to 0.30 bar).
► In-situ Raman spectroscopy study of water insertion.
► High wavenumber range presents two OH vibrations modes.
► Possible change of coupling of lattice modes during OH insertion at low wavenumber.
► Complex proton environment.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 191, Issue 1, 2 June 2011, Pages 24–31
نویسندگان
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