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Effect of V addition on magnetic, transport, and microstructural properties of La 0.7 Sr 0.3 MnO 3
Author(s) -
Zhao T.S.,
Li B. H.,
Han G.
Publication year - 2008
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200723547
Subject(s) - sintering , crystallite , materials science , curie temperature , microstructure , analytical chemistry (journal) , phase (matter) , saturation (graph theory) , magnetization , grain size , liquid phase , grain growth , mineralogy , magnetic field , metallurgy , condensed matter physics , ferromagnetism , chemistry , thermodynamics , physics , mathematics , organic chemistry , chromatography , combinatorics , quantum mechanics
The microstructural, magnetic, and magnetotransport properties of polycrystalline samples with nominal composition of La 0.7 Sr 0.3 Mn 1– x V x O 3 (0 ≤ x ≤ 0.25) sintered in air have been investigated. It is found that V could not substitute for Mn to form La 0.7 Sr 0.3 Mn 1– x V x O 3 . The samples contain several phases such as (La, Sr)Mn 1– δ O 3 , LaSr 3 V 3 O 12 , Mn 3 O 4 etc. and constitute multi‐phase composites. The Sr–V‐rich phase form a liquid phase during sintering process and the sintering be long to liquid‐phase sintering, which may effectively promote grain growth of (La, Sr)Mn 1– δ O 3 phase. The Curie temperature T C and saturation magnetization of the composites decrease with increasing the V content x . The addition of V may effectively improve the low‐field MR response at low temperatures due to the variation in the microstructure of the composites. The MR ratio at a low field of 2 kOe reaches 25% for the x = 0.15 sample at 84 K. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)