Electromagnetic wave absorption and dielectric-modulation of metallic perovskite lanthanum nickel oxide

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	Electromagnetic wave absorption and dielectric-modulation of metallic perovskite lanthanum nickel oxide
	J. J.; Li Jiang, D.; Li, S. J.; Wang, Z. H.; Wang, Y.; He, J.; Liu, W.; Zhang, Z. D.
	2015
发表期刊	Rsc Advances
ISSN	2046-2069
卷号	5 期号:19 页码:14584-14591
摘要	Electromagnetic (EM) wave absorption properties of metallic perovskite lanthanum nickel oxide (LNO) powder and dielectric-modulated LNO-FeCo/C composites were investigated. Reflection loss (RL) of the LNO-paraffin composites depends on the mass ratio of LNO powder dispersion in the paraffin matrix, in which the optimal RL of -24.7 dB at 17.6 GHz with the absorbent layer thickness of 1.6 mm is obtained at the 10 wt% LNO-paraffin composite, just below the percolation threshold (PC) of the LNO dispersion in the paraffin matrix. Three absorption peaks in the frequency dependence of RL of the 10 wt% LNO-paraffin composite are ascribed to the dielectric relaxations which occurred at frequencies of about 3.3, 9.2 and 15.1 GHz. Dielectric-modulation by metal-conductive LNO powder significantly increases the relative complex permittivity of the (x) LNO-(y) FeCo/C-paraffin composites and a good impedance match coming from the dielectric-modulation by the LNO powder would be obtained just below the PC of the LNO powder dispersion in the paraffin matrix. The (8 wt%) LNO-(32 wt%) FeCo/C-paraffin composite exhibited an enhanced EM wave absorption performance, in which RL values less than -20 dB can be obtained in the 2-18 GHz range by choosing an appropriate thickness from 1.3 mm to 8 mm and the minimum RL is 50.6 dB at 9 GHz with the absorbent layer thickness of 2.4 mm.
部门归属	[jiang, j. j. ; li, d. ; li, s. j. ; wang, z. h. ; liu, w. ; zhang, z. d.] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [jiang, j. j. ; li, d. ; li, s. j. ; wang, z. h. ; liu, w. ; zhang, z. d.] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. [wang, y. ; he, j.] cent iron & steel res inst, div funct mat, beijing 100081, peoples r china. ; li, d (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china. ; dali@imr.ac.cn
关键词	Microwave-absorption Complex Permittivity Lanio3-delta Films Carbon Nanotubes Thin-films X-band Composites Behavior Nanocomposites Conductivity
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/73830
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. J.,Li Jiang, D.,Li, S. J.,et al. Electromagnetic wave absorption and dielectric-modulation of metallic perovskite lanthanum nickel oxide[J]. Rsc Advances,2015,5(19):14584-14591.
APA	J. J..,Li Jiang, D..,Li, S. J..,Wang, Z. H..,Wang, Y..,...&Zhang, Z. D..(2015).Electromagnetic wave absorption and dielectric-modulation of metallic perovskite lanthanum nickel oxide.Rsc Advances,5(19),14584-14591.
MLA	J. J.,et al."Electromagnetic wave absorption and dielectric-modulation of metallic perovskite lanthanum nickel oxide".Rsc Advances 5.19(2015):14584-14591.