Nanocrystalline La1-xSrxCo1-yFeyO3 perovskites fabricated by the micro-emulsion route for high frequency response devices fabrications

作者：Khan Muhammad Azhar^*; Khan Kamran; Mahmood Azhar; Murtaza Gulam; Akhtar Majid Niaz; Ali Irshad; Shahid Muhammad; Shakir Imran; Warsi Muhammad Farooq

来源：Ceramics International, 2014, 40(8): 13211-13216.

DOI：10.1016/j.ceramint.2014.05.027

• Dielectric properties
• Perovskites
• Nanocrystalline
• XRD
• Microwave devices

Nanocrystalline La1-xSrxCo1-yFeyO3 (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 (141IR) spectroscopy, and scanning electron microscopy (SEM). TGA analysis showed similar to 35% weight loss. The crystallite size determined by XRD and SEM ranged from similar to 30 to 80 nm and 30 to 50 nm, respectively. The dielectric behavior was evaluated in the range of 1.0 x 106 Hz to 3.0 x 10(9) Hz at 298 K, the dielectric parameters resulting appreciably enhanced by co-doping with Sr and Fe. The maximum dielectric parameters (epsilon%26apos;= 103.35, epsilon %26apos;%26apos;=58.92 and tan delta=0.57) were observed for La0.4Sr0.6Co Fe 0.4- -0.603 at 15 x 10(6) Hz. Results suggest the potential use of these nanocrystalline perovskites in GHz-operated microwave devices.

• 出版日期2014-9