Structure and properties of La0.6Sr0.4-xBaxMnO3 (0 <= x <= 0.4) magnetoresistive ceramics
2002 (English)In: Inorganic Materials (Neorganicheskie materialy), ISSN 0020-1685, E-ISSN 1608-3172, Vol. 38, no 3, 302-307 p.Article in journal (Refereed) Published
The effect of Ba content on the phase composition, lattice parameter, Mn-55 NMR spectrum, resistance, and magnetoresistance of La0.6Sr0.4-xBaxMnO3 perovskites was studied. The lattice parameter of the single-phase ceramic samples was found to increase with increasing x. The tolerance factor increases and the ionic field strength decreases as x increases from 0 to 0.4. The Mn-55 NMR results obtained at 77 K indicate a high-frequency electron exchange between Mn3+ and Mn4+ in the ferromagnetic phase. The peak-magnetoresistance temperature tends to decrease with increasing x. The magnetoresistance of the ceramics is correlated with the bond covalence. It is inferred that the ceramics contain inhomogeneities differing in nature and length scale (macroscopic, mesoscopic, and microscopic), which influence their magnetoresistance.
Place, publisher, year, edition, pages
2002. Vol. 38, no 3, 302-307 p.
ferromagnetic manganites, transport-properties, magnetic-properties, mn-55 nmr, mn
IdentifiersURN: urn:nbn:se:kth:diva-21433ISI: 000174776900022OAI: oai:DiVA.org:kth-21433DiVA: diva2:340131
QC 201005252010-08-102010-08-10Bibliographically approved