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Synthesis, nuclear structure, and magnetic properties of LaCr1-yMnyO3 (y=0, 0.1, 0.2, and 0.3)
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
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2008 (English)In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 457, no 1-2, 532-540 p.Article in journal (Refereed) Published
Abstract [en]

The nuclear structure and magnetic properties of perovskite-type samples of compositions LaCr1-xMnyO3 (y=0, 0.1, 0.2, 0.3) have been studied using neutron powder diffraction technique and magnetization measurements. All samples have orthorhombic structure with space group Pnma (No. 62) in the temperature range 1.5-400 K. The pure lanthanum chromate LaCrO3 is a G-type antiferromagnet with a Neel temperature of 290 K. The Mn substituted samples also order antiferromagnetically at about 290 K, with canted magnetic moments yielding a ferromagnetic component.

Place, publisher, year, edition, pages
2008. Vol. 457, no 1-2, 532-540 p.
Keyword [en]
LaCrO3, Manganese substitution, Neutron powder diffraction, Magnetic structure, Magnetic moment, Antiferromagnetism, SQUID
National Category
Inorganic Chemistry Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-92727DOI: 10.1016/j.jallcom.2007.03.069ISI: 000256124900094OAI: oai:DiVA.org:uu-92727DiVA: diva2:165908
Available from: 2005-03-17 Created: 2005-03-17 Last updated: 2016-04-13
In thesis
1. Synthesis, Nuclear Structure, and Magnetic Properties of some Perovskite Oxides
Open this publication in new window or tab >>Synthesis, Nuclear Structure, and Magnetic Properties of some Perovskite Oxides
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Synthesis, nuclear structure, and magnetic properties of the perovskites: Nd0.7-xMgxSr0.3MnO3 (x=0.0, 0.1), Nd0.6Mg0.1Sr0.3Mn1-zMgzO3 (z=0.1, 0.2), LaCr1-yMnyO3 (y=0.0, 0.1, 0.2, 0.3) and La1-xNdxFe0.5Cr0.5O3 (x=0.1, 0.15, 0.2) have been studied. The structure of the samples was investigated by X-ray and Neutron powder diffraction and the magnetic properties were investigated by magnetization measurements using SQUID-magnetometry. All compounds have orthorhombic structure with spacegroup Pnma (No. 62).

The compounds which had the composition Nd0.7Sr0.3Mn1-yMgyO3 by preparation, were found to attain the composition Nd0.7-xMgxSr0.3MnO3 and Nd0.6Mg0.1Sr0.3Mn1-zMgzO3. The x=0.0 and 0.1 compounds order in a pure ferromagnetic structure at about 200 K, but the Mn moments become slightly tilted and attain an antiferromagnetic component below 20 K. A ferromagnetic Nd moment also appears at low temperatures. The compounds with Mg substitution y=0.2 and 0.3 do not exhibit long range magnetic order, but local ferromagnetic correlations among the Mn moments appear below 200 K. At low temperature, also a local antiferromagnetic ordering of the Nd magnetic moments occurs. In these compounds, the Mn3+/Mn4+ ratio is reduced so that the double exchange interaction is suppressed and the antiferromagnetic superexchange interaction favoured.

The samples of composition LaCr1-yMnyO3 have orthorhombic structure at room temperature and below. The magnetic properties of the system are markedly affected by Mn-substitution. The parent compound LaCrO3 is a pure G-type antiferromagnet with Néel temperature 290 K. With incresing Mn-substitution, a ferromagnetic component developes in the ordered phase bcause of canting of the magnetic moments. The degree of canting increases with increasing Mn-substitution and the magnitude of the antiferromagnetic component of the moment decreases. The system La1-xNdxFe0.5Cr0.5O3 has the same antiferromagnetic G-type structure as LaCrO3, but orders already at temperatures above 400 K and develops only a very weak ferromagnetic component of the magnetic moment at low temperatures.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 50 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 24
Keyword
Materials science, Magnetic Perovskites, Neutron powder diffraction, SQUID, Synthesis, Nuclear structure, Antiferromagnetism, Ferromagnetism, Superexchange, Double exchange, Colossal magnetoresistance, Materialvetenskap
National Category
Materials Engineering
Identifiers
urn:nbn:se:uu:diva-4826 (URN)91-554-6175-1 (ISBN)
Public defence
2005-04-07, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 10:00 (English)
Opponent
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Available from: 2005-03-17 Created: 2005-03-17 Last updated: 2009-03-27Bibliographically approved

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