uu.seUppsala University Publications
Change search
ReferencesLink to record
Permanent link

Direct link
Magnesium substitution in Nd0.7Sr0.3MnO3
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Show others and affiliations
2004 (English)In: J. Solid State Chem., Vol. 177, 966-971 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2004. Vol. 177, 966-971 p.
URN: urn:nbn:se:uu:diva-92725OAI: oai:DiVA.org:uu-92725DiVA: diva2:165906
Available from: 2005-03-17 Created: 2005-03-17 Last updated: 2013-03-21
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.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 24
Materials science, Magnetic Perovskites, Neutron powder diffraction, SQUID, Synthesis, Nuclear structure, Antiferromagnetism, Ferromagnetism, Superexchange, Double exchange, Colossal magnetoresistance, Materialvetenskap
National Category
Materials Engineering
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)
Available from: 2005-03-17 Created: 2005-03-17 Last updated: 2009-03-27Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Nordblad, P.
By organisation
Solid State Physics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 428 hits
ReferencesLink to record
Permanent link

Direct link