Synthesis and characterization of the colossal magnetoresistance manganite La-1.2(Sr1.4Ca0.4)Mn2O7 by citrate gel

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Title:	Synthesis and characterization of the colossal magnetoresistance manganite La-1.2(Sr1.4Ca0.4)Mn2O7 by citrate gel
Authors:	Chen C.C. Shen C.H. Liu R.S. Lin J.G. Huang C.Y.
Contributors:	材料所
Keywords:	inorganic compounds oxides magnetic materials crystal structure
Date:	2002
Issue Date:	2009-12-11
Abstract:	Single-phase La-1.2(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 [rho - rho(H)]/rho(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. (C) 2002 Elsevier Science Ltd. All rights reserved.
Relation:	MATERIALS RESEARCH BULLETIN Volume: 37 Issue: 2 Pages: 235-246
Appears in Collections:	[Department of Chemical & Materials Engineering] journal articles

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