Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 322, Issue 13, Pages 1720-1726Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2009.12.013
Keywords
Dielectric properties; FTIR; TEM; Electrical properties; Calcium doped material
Funding
- Education Commission (HEC), Pakistan
- Bahauddin Zakariya University (BZU), Multan
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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.
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