Synthesis and characterization of the colossal magnetoresistance manganite La1.2(Sr1.4Ca0.4)Mn2O7 by citrate gel
Journal
Materials Research Bulletin
Journal Volume
37
Journal Issue
2
Pages
235-246
Date Issued
2002
Author(s)
Abstract
Single-phase La1.2(Sr1.4Ca0.4)Mn2O7 has been synthesized from the aqueous solution of metal nitrates and citric acid by the sol-gel technique. Small particle size with high homogeneity of the powder was obtained. The valence of Mn is determined to be 3.45±0.05 by chemical titration. The MR ratio [ρ - ρ(H)]/ρ(H), is 115% (102 K, 1.5 T) for the composition prepared by the citrate route, and is nearly three times larger than that of the sample prepared by solid state reaction. © 2002 Elsevier Science Ltd. All rights reserved.
SDGs
Type
journal article