Magnetoresistive properties of Ni-doped La^sub 0.7^Sr^sub 0.3^MnO3 manganites

La0.7Sr0.3Mn1-xNixO3 (x = 0, 0.025, 0.050 and 0.075) ceramics were prepared by the conventional solid-state reaction method. The partial substitution of Mn by Ni2+ leads to a decrease in cell volume as well as a structural transition from the rhombohedral to the orthorhombic structure. Ni2+ doping i...

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Bibliographic Details
Published in:Rare metals 2016-07, Vol.35 (7), p.551
Main Authors: Ahmed, Ahmed Mohamed, Mohamed, Abd El-moez, Ahmed, Abdellateef, Medhat Abdelrady, Abd El-ghanny, Hassan Ahmed
Format: Article
Language:English
Online Access:Get full text
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Summary:La0.7Sr0.3Mn1-xNixO3 (x = 0, 0.025, 0.050 and 0.075) ceramics were prepared by the conventional solid-state reaction method. The partial substitution of Mn by Ni2+ leads to a decrease in cell volume as well as a structural transition from the rhombohedral to the orthorhombic structure. Ni2+ doping increases the electrical resistivity, decreases the semiconductor-metal transition temperature (T ms) and relatively enhances the room temperature magnetoresistance (MR), especially in x = 0.025 and around T ms. With respect to conduction mechanism, the small polaron hopping (SPH) and the variable range hopping (VRH) models were used to examine conduction in the semiconducting region.
ISSN:1001-0521
1867-7185
DOI:10.1007/s12598-015-0465-x