Crystal structure of LaMnO[sub 3+[delta]] synthesized using poly(acrylic acid)

Journal Article · Tue Jun 01 04:00:00 EDT 1993 · Journal of Solid State Chemistry; (United States)

DOI:https://doi.org/10.1006/jssc.1993.1181· OSTI ID:5856450

Taguchi, Hideki; Yoshioka, Hideaki; Matsuda, Daisuke; Nagao, Mahiko ^[1]

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1. Okayama Univ. (Japan)

Poly(acrylic acid) (PAA) was used to make a gel from an aqueous solution of lanthanum and manganese nitrates. In the concentration range 3 [times] 10[sup [minus]2] to 5 [times] 10[sup [minus]2] M of PAA, the single phase of perovskite-type LaMnO[sub 3+[delta]] was synthesized by firing gels at low temperature. The crystal structure of LaMnO[sub 3+[delta]] changes from hexagonal to orthorhombic with increasing concentration of PAA. At 5 [times] 10[sup [minus]2] M of PAA, the crystal structure of LaMnO[sub 3+[delta]] changes from orthorhombic to hexagonal with increasing temperature. 8 refs., 3 figs.

• OSTI ID: 5856450
• Journal Information: Journal of Solid State Chemistry; (United States), Journal Name: Journal of Solid State Chemistry; (United States) Vol. 104:2; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ACRYLIC ACID
CARBOXYLIC ACIDS
CHALCOGENIDES
CHEMICAL PREPARATION
COLLOIDS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFERENTIAL THERMAL ANALYSIS
DISPERSIONS
GELS
HEXAGONAL LATTICES
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MANGANESE COMPOUNDS
MANGANESE OXIDES
MONOCARBOXYLIC ACIDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORTHORHOMBIC LATTICES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
STOICHIOMETRY
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS