XPS/FTIR study of the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7]

The combination of X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and simultaneous thermal analysis (STA) studies has shown that the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7] occurs at room temperature and above, resulting in the formation of the...

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Bibliographic Details
Published in:Inorganic chemistry 1993-11, Vol.32:24
Main Authors: Lin, Jianyi, Wee, A.T.S., Tan, Kuang Lee, Neoh, Koon Gee, Teo, Wah Koon
Format: Article
Language:English
Subjects:
400201 - Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COPPER COMPOUNDS
COPPER OXIDES
ELECTRON SPECTROSCOPY
GRAVIMETRIC ANALYSIS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
QUANTITATIVE CHEMICAL ANALYSIS
REDUCTION
SPECTROSCOPY
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Description
Summary:The combination of X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and simultaneous thermal analysis (STA) studies has shown that the interaction between NO and YBa[sub 2]Cu[sub 3]O[sub 7] occurs at room temperature and above, resulting in the formation of the nitride, nitrate, nitrite (NO[sub 2][sup [minus]]), and nitrito (-ONO) groups, as well as in the release of N[sub 2], NO[sub 2], and N[sub 2]O. The nitride species are observed at temperatures between 300 and 540 K but not at higher temperatures. The nitrate ion is the predominant nitrogen-containing species at temperatures below 540 K, and its concentration decays at elevated temperatures (>820 K). The nitrito group can be found at room temperature as well as elevated temperatures. The nitrite ion is observed with relatively low concentrations at lower temperatures but becomes the predominant nitrogen-containing species at high temperatures. The maximum increase in the sample weight ([approximately]7%) as measured by thermogravimetry (TG) corresponds to a net uptake of a NO[sub 2] group (or an NO molecule plus an O atom) per unit cell of YBa[sub 2]Cu[sub 3]O[sub 7]. The NO interaction also results in the oxidation of a small portion (
ISSN:0020-1669
1520-510X
DOI:10.1021/ic00076a019