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Reexamination of the Role of SrMoO 4 in the Enhancement of the Low‐Field Magnetoresistance of Sr 2 FeMoO 6
Author(s) -
Fang TsangTse,
Lin JungCheng
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.tb20098.x
Subject(s) - magnetoresistance , materials science , transmission electron microscopy , amorphous solid , grain boundary , electrical resistivity and conductivity , phase (matter) , strontium , nanometre , magnetization , analytical chemistry (journal) , condensed matter physics , chemistry , crystallography , magnetic field , nanotechnology , metallurgy , microstructure , physics , organic chemistry , chromatography , quantum mechanics , composite material
Different ratios of the precursor phases of SrFeO 3– x (SFO) and SrMoO 4 (SMO) were used to prepare Sr 2 FeMoO 6 (SFMO) by a solid‐state reaction. X‐ray diffraction was used to identify the phases. A residual SMO was observed to exist in the sample with an SFO/SMO ratio of 0.9:1. The sample with a residual SMO phase had higher resistivity, lower magnetization, but higher low‐field magnetoresistance (LFMR). High‐resolution transmission electron microscopy was used to identify the compositions and phases. Nanometer‐sized amorphous‐like clusters of SMO phase were located inside the grains rather than at grain boundaries; however, some boundaries were rich in the strontium ion. The possible mechanisms for the conduction and the increase of LFMR of SFMO are discussed.