Discontinuous evolution of the highly distorted orthorhombic structure and the magnetic order in LaMnO[sub 3[+-][delta]] perovskite

Journal Article · Wed Sep 01 00:00:00 EDT 1999 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.1999.8386· OSTI ID:6068128

Prado, F; Sanchez, R D; Caneiro, A; Causa, M T; Tovar, M ^[1]

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1. Comision Nacional de Energia Atomica, San Carlos de Bariloche (Argentina). Centro Atomico Bariloche

In this work the authors present a systematic study of the crystallographic structure and the magnetic ordering of LaMnO[sub 3[+-][delta]] perovskites. Changing the oxygen composition within the range 2.995 < 3 [+-] [delta] < 3.140, they found a 3 + [delta][sub 1] value (3.04 < 3 + [delta][sub 1] < 3.05) which defines a boundary in the magnetic phase diagram T vs 3 [+-] [delta]. For 3 + [delta] < 3 + [delta][sub 1], antiferromagnetic order is present in the samples with a small ferromagnetic component, while for large 3 + [delta] values (3 + [delta] > 3 + [delta][sub 1]) the samples are ferromagnetic. The transition from one region to the other is associated with a change in volume of around 1%.

• OSTI ID: 6068128
• Journal Information: Journal of Solid State Chemistry, Vol. 146:2; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
FERROMAGNETISM
JAHN-TELLER EFFECT
LANTHANUM OXIDES
MAGNETIC PROPERTIES
MANGANESE OXIDES
STOICHIOMETRY
TEMPERATURE DEPENDENCE
X-RAY DIFFRACTION
CHALCOGENIDES
COHERENT SCATTERING
DATA
DIFFRACTION
INFORMATION
LANTHANUM COMPOUNDS
MAGNETISM
MANGANESE COMPOUNDS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
360202* - Ceramics
Cermets
&amp; Refractories- Structure &amp; Phase Studies
360204 - Ceramics
Cermets
&amp; Refractories- Physical Properties