Electrical properties and phase transition of CoFe2O4 nanocrystals under pressure

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	Electrical properties and phase transition of CoFe2O4 nanocrystals under pressure
	Wu, ZY ; Bao, ZX ; Cao, L ; Liu, CX ; Li, QS ; Xie, SS ; Zou, BS
刊名	JOURNAL OF APPLIED PHYSICS
	2003
卷号	93 期号:12 页码:9983
关键词	CDSE NANOCRYSTALS TRANSFORMATION TEMPERATURE PARAMETERS PARTICLES DYNAMICS ENERGIES WURTZITE SI
ISSN号	0021-8979
通讯作者	Zou, BS: Chinese Acad Sci, Inst Phys, Nanoscale Phys & Device LAB, POB 603, Beijing 100080, Peoples R China.
中文摘要	The electric resistance CoFe2O4 nanocrystals of different sizes, obtained by the coprecipitation method was investigated under pressure up to 20 GPa in a diamond anvil cell at ambient temperature. The experimental results indicate that the phase transition (from the spinel to a tetragonal structure) takes place at 7.5 and 12.5 GPa for 6 and 80 nm, nanocrystals, respectively, in agreement with the prediction of scaling theory of the phase transition of nanocrystals. The relatively low transition pressure for CoFe2O4 is related to the high d-electron coupling between magnetic ions and to the small band gap in CoFe2O4 as compared to the other spinel ferrites. These results are discussed in terms of decreasing band gap with increasing pressure. The smaller the size of nanocrystals, the higher the phase transition pressure. The resistance of CoFe2O4 nanocrystal decreases exponentially under pressure, according to Rproportional toexp(-CP), where C=0.7634 GPa(-1) for large nanocrystals (80 nm) and C=0.5124 GPa(-1) for CoFe2O4 of 6 nm. (C) 2003 American Institute of Physics.
收录类别	SCI
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/36939]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Wu, ZY,Bao, ZX,Cao, L,et al. Electrical properties and phase transition of CoFe2O4 nanocrystals under pressure[J]. JOURNAL OF APPLIED PHYSICS,2003,93(12):9983.
APA	Wu, ZY.,Bao, ZX.,Cao, L.,Liu, CX.,Li, QS.,...&Zou, BS.(2003).Electrical properties and phase transition of CoFe2O4 nanocrystals under pressure.JOURNAL OF APPLIED PHYSICS,93(12),9983.
MLA	Wu, ZY,et al."Electrical properties and phase transition of CoFe2O4 nanocrystals under pressure".JOURNAL OF APPLIED PHYSICS 93.12(2003):9983.