Nanocrystalline La1-xSrxCo1-yFe yO3 perovskites fabricated by the micro-emulsion route for high frequency response devices fabrications
AuthorsAzhar Khan, Muhammad
Akhtar, Majid Niaz
Ali, Irshad M.
Farooq Warsi, Muhammad
KAUST DepartmentMaterials Science and Engineering Program
Physical Sciences and Engineering (PSE) Division
MetadataShow full item record
AbstractNanocrystalline La1-xSrxCo1-yFe yO3 (x=0.00-0.60) perovskites were fabricated by a cheap economic route (i.e. micro-emulsion method) and characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM). TGA analysis showed ~35% weight loss. The crystallite size determined by XRD and SEM ranged from 30 to 80 nm and ~30 to 50 nm, respectively. The dielectric behavior was evaluated in the range of 1.0×106 Hz to 3.0×10 9 Hz at 298 K, the dielectric parameters resulting appreciably enhanced by co-doping with Sr and Fe. The maximum dielectric parameters (ε′=103.35, ε″=58.92 and tan δ=0.57) were observed for La0.4Sr0.6Co0.4Fe0.6O 3 at 15×106 Hz. Results suggest the potential use of these nanocrystalline perovskites in GHz-operated microwave devices. © 2014 Elsevier Ltd and Techna Group S.r.l.
SponsorsWe are thankful to The Islamia University of Bahawalpur-63100 (Pakistan) and Higher Education Commission of Pakistan. One of the authors (Dr. I. Shakir) is thankful to Deanship of Scientific Research at King Saud University (RGP-VPP-312). The international foundation for science (IFS), Sweden is also highly acknowledged for grant no. W/5408-1.