The crystal structure of lanthanum manganate(III), LaMnO{sub 3}, at room temperature and a 1273 K under N{sub 2}

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

DOI:https://doi.org/10.1016/0022-4596(95)80028-N· OSTI ID:237566

Norby, P; Krogh Andersen, I G; Krogh Andersen, E ^[1]

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1. Univ. of Odense (Denmark); and others

Orthorhombic stoichiometric LaMnO{sub 3} is prepared by heating rhombohedral LaMnO{sub 3+{delta}} under N{sub 2} at 1173 K and cooling to room temperature under N{sub 2}. The thermal transformations of orthorhombic lanthanum manganate(III) were investigated using high-temperature X-ray powder diffraction. Transformations orthorhombic-cubic-rhombohedral were observed. The dependence of the unit cell parameters on temperature was determined. The crystal structures of LaMnO{sub 3} at room temperature (orthorhombic) and at high temperature (rhombohedral at 1273 K in N{sub 2}) were determined using neutron powder diffraction.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 237566
• 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

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
CUBIC LATTICES
LANTHANUM COMPOUNDS
MANGANATES
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
TRIGONAL LATTICES