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	Preparation of superparamagnetic maghemite (gamma-fe2o3) nanoparticles by wet chemical route and investigation of their magnetic and dielectric properties
	Ali, Kashif1; Sarfraz, A. K.1; Mirza, Imran M.1; Bahadur, A.1,2; Iqbal, S.2; ul Haq, A.3
刊名	Current applied physics
	2015-08-01
卷号	15期号:8页码:925-929
关键词	Superparamagnetic maghemite (gamma-fe2o3) nanoparticles Wet chemical method Xrd measurements Dielectric constant and tangent losses M-h and m-t loop
ISSN号	1567-1739
DOI	10.1016/j.cap.2015.04.030
通讯作者	Sarfraz, a. k.(sakqau1@gmail.com)
英文摘要	Maghemite (gamma-fe2o3) nanoparticles have been synthesized using a wet chemical route, optimizing the reaction time, ph value and size of the crystallite during synthesis. the powder x-ray diffraction (xrd) measurements confirmed the presence of an impurity free maghemite phase in our sample with an average crystallite size of 16 nm as calculated from the debye-scherrer equation. in physical characterization, the room temperature hysteresis (m-h loop) and blocking temperature (as observed from the m-t plot) revealed that the particles are in the superparamagnetic phase at room temperature. dielectric behaviour of gamma-fe2o3 with respect to the variation of frequency and temperature was also performed. at room temperatures, we observe a decaying behaviour of both dielectric constant (epsilon) and tangent looses (tan delta) at smaller frequencies while at higher frequencies both saturate to smaller constant values. in temperature dependent dielectric properties we notice that the dielectric constant (both real and imaginary parts) show an increasing trend with increasing temperatures but an overall slower enhancement at elevated frequencies. the former effect can be attributed to the possible delocalization of impurities at higher temperatures while the latter effect can be explained as an inability of the electric dipole moments to respond at higher frequencies. (c) 2015 elsevier b.v. all rights reserved.
WOS关键词	IRON-OXIDE NANOPARTICLES ; LOW-TEMPERATURE ; SURFACE ; NANOSTRUCTURES ; ALPHA-FE2O3 ; PARTICLES ; FE3O4 ; FILMS ; FIELD ; SIZE
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000356550400014
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2376477
专题	中国科学院大学
通讯作者	Sarfraz, A. K.
作者单位	1.Quaid I Azam Univ, Islamabad, Pakistan 2.Univ Chinese Acad Sci, Sch Chem & Chem Engn, Beijing 100049, Peoples R China 3.Riphah Int Univ, Islamabad, Pakistan
推荐引用方式 GB/T 7714	Ali, Kashif,Sarfraz, A. K.,Mirza, Imran M.,et al. Preparation of superparamagnetic maghemite (gamma-fe2o3) nanoparticles by wet chemical route and investigation of their magnetic and dielectric properties[J]. Current applied physics,2015,15(8):925-929.
APA	Ali, Kashif,Sarfraz, A. K.,Mirza, Imran M.,Bahadur, A.,Iqbal, S.,&ul Haq, A..(2015).Preparation of superparamagnetic maghemite (gamma-fe2o3) nanoparticles by wet chemical route and investigation of their magnetic and dielectric properties.Current applied physics,15(8),925-929.
MLA	Ali, Kashif,et al."Preparation of superparamagnetic maghemite (gamma-fe2o3) nanoparticles by wet chemical route and investigation of their magnetic and dielectric properties".Current applied physics 15.8(2015):925-929.

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