Surface characterization of LaMnO{sub 3+{delta}} powder annealed in air

Journal Article · Sun Oct 01 04:00:00 EDT 1995 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/0022-4596(95)80025-K· OSTI ID:237563

Taguchi, H; Sugita, A; Nagao, M ^[1]

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1. Okayama Univ. (Japan); and others

Perovskite-type LaMnO{sub 3+{delta}}, synthesized using poly(acrylic acid) (PAA), was annealed at 400 and 700{degrees}C in air for 6-54 hr. The crystallite size, the specific surface area, the La/Mn ratio, and the catalytic activity of LaMnO{sub 3+{delta}} were measured to characterize the surface. The specific surface area decreased slightly with increasing annealing time, while the La/Mn ratio of the surface, calculated from the XPS measurements, was independent of annealing time. The catalytic activity for the oxidation of CO increased with annealing. These results suggest that annealing improved the crystallinity (regularity of the ions) of the LaMnO{sub 3+{delta}} surface.

• OSTI ID: 237563
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 119; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
40 CHEMISTRY
ANNEALING
CARBON MONOXIDE
CATALYTIC EFFECTS
LANTHANUM OXIDES
MANGANESE OXIDES
MICROSTRUCTURE
OXIDATION
PHOTOELECTRON SPECTROSCOPY
SPECIFIC SURFACE AREA
SURFACE PROPERTIES
X-RAY SPECTROSCOPY