Physical, electrical and dielectric properties of Ca-substituted strontium hexaferrite (SrFe12O19) nanoparticles synthesized by co-precipitation method

被引:218
作者
Iqbal, Muhammad Javed [1 ]
Ashiq, Muhammad Naeem [2 ]
Gul, Iftikhar Hussain [3 ]
机构
[1] Quaid I Azam Univ, Dept Chem, Surface & Solid State Chem Lab, Islamabad 45320, Pakistan
[2] Bahauddin Zakariya Univ, Multan, Pakistan
[3] NUST, Sch Chem & Mat Engn, Islamabad, Pakistan
关键词
Dielectric properties; FTIR; TEM; Electrical properties; Calcium doped material; MAGNETIC-PROPERTIES; FERRITES; BARIUM; SHAPE; GEL;
D O I
10.1016/j.jmmm.2009.12.013
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Calcium substituted strontium hexaferrite CaxSr1-xFe12O19 (x=0.0-0.6) nanoparticles are synthesized by chemical co-precipitation method. The synthesized samples are characterized by Fourier Transform Infrared (FTIR), X-ray diffraction (XRD), Scanning Electron Microscopy, Transmission Electron Microscopy, DC electrical resistivity and dielectric measurements. FTIR data of uncalcined sample shows that nitrate ions are present which disappeared on calcination at 920 degrees C. The XRD data shows that a single hexagonal magnetoplumbite phase is formed in samples in which the calcium content, x, is <= 0.20. However, a nonmagnetic phase (alpha-Fe2O3) in addition to the hexagonal phase is also present in samples with x>0.20. The average crystallite size is found between 17 and 29 nm. The DC electrical resistivity increases with increase of calcium content upto level of x=0.2 but decreased on further addition of calcium. The enhanced resistivity of the calcium doped material has potential applications in microwave devices. The variations of dielectric constant and dielectric loss angle are explained on the basis of Maxwell-Wagner and Koops models. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:1720 / 1726
页数:7
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