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

Journal Article · Sun Oct 01 00:00:00 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, Vol. 119, Issue 1; Other Information: PBD: Oct 1995
• Country of Publication: United States
• Language: English

Related Subjects

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