Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO(3+delta) compounds

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	Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO(3+delta) compounds
	X. L. Wang; D. Li; C. X. Shi; B. Li; T. Y. Cui; Z. D. Zhang
	2010
发表期刊	Physica B-Condensed Matter
ISSN	0921-4526
卷号	405 期号:5 页码:1362-1368
摘要	Rhombohedral LaMnO(3+delta) powders were successfully synthesized by annealing gel precursors obtained by a polymerized complex method. The average grain size increases with increasing calcination temperature. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves indicate that LaMnO(3+delta) compounds obtained at 700 and 800 degrees C are ferromagnetic, while both ferromagnetic and antiferromagned c components are present in those calcined at 900 and 1000 degrees C. This is because the concentration of Mn(4+) ions drops with increasing calcination temperature. The temperature dependence of the resistivity of LaMnO(3+delta) Compounds exhibits an insulator-metal transition at about 90 K and also a low-temperature upturn with a resistivity minimum at about 40 K. Upon increasing particle size, the zero-field resistivity of the LaMnO(3+delta) powders increases due to suppression of the conduction by the insulating antiferromagnetic component. The negative magnetoresistance of a sample pellet prepared at 700 degrees C ranges from - 82% to - 88% in the temperature range of 40-100 K due to suppression of the spin-dependent scattering by an applied field. (C) 2009 Elsevier B.V. All rights reserved.
部门归属	[li, d.] inst met sci & technol, shenyang natl lab mat sci, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;li, d (reprint author), inst met sci & technol, shenyang natl lab mat sci, 72 wenhua rd, shenyang 110016, peoples r china;dali@imr.ac.cn
关键词	Polymerized Synthesis Magnetic Properties Magnetoresistance Giant Magnetoresistance Manganites Ceramics
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31528
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. L. Wang,D. Li,C. X. Shi,et al. Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO(3+delta) compounds[J]. Physica B-Condensed Matter,2010,405(5):1362-1368.
APA	X. L. Wang,D. Li,C. X. Shi,B. Li,T. Y. Cui,&Z. D. Zhang.(2010).Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO(3+delta) compounds.Physica B-Condensed Matter,405(5),1362-1368.
MLA	X. L. Wang,et al."Effect of the calcination temperature on the magnetic and transport properties of rhombohedral LaMnO(3+delta) compounds".Physica B-Condensed Matter 405.5(2010):1362-1368.