Phase stability study of La1.2Ca1.8Mn2O7

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Title:	Phase stability study of La1.2Ca1.8Mn2O7
Authors:	Shen CH Liu RS Lin JG Huang CY
Contributors:	材料所
Keywords:	inorganic compounds oxides magnetic materials crystal structure
Date:	2001
Issue Date:	2009-12-11 11:34:42 (UTC+8)
Abstract:	We report that the composition of La1.2Ca1.8Mn2O7 does not form as a single phase, and consists of a mixture: of La0.6Ca0.4MnO3 and CaO. The XRD patterns show the presence of a peak at 2 theta similar to 37 degrees, which is a specific peak to indicate the existence of CaO with space group Fm3m and a unit cell of a = 4.8152(3) Angstrom. After a few days, the intensity of this peak decreases and CaO transforms to Ca(OH),. The electrical and magnetic measurements show that the colossal magnetoresistance (CMR) behavior corresponds to that exhibited by La0.6Ca0.4MnO3. (C) 2001 Elsevier Science Ltd. All rights reserved.
Relation:	MATERIALS RESEARCH BULLETIN Volume: 36 Issue: 5-6 Pages: 1139-1148
Appears in Collections:	[Department of Chemical & Materials Engineering] journal articles

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