Electrical properties of bismuth potassium titanate-strontium titanate ferroelectric ceramics

• Published in: ECTI-CON2010: The 2010 ECTI International Confernce on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology pp. 962 - 965
• Main Authors: Phetnoi, Prapapim, Niemcharoen, Surasak, Muanghlua, Rangson, Sutapun, Manoon, Vittayakorn, Naratip
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01-05-2010
• Subjects: Bismuth; Ceramics; Dielectric constant; Electrons; Environmentally friendly manufacturing techniques; Ferroelectric materials; Solid state circuits; Temperature; Titanium compounds; X-ray diffraction
• ISBN: 9781424456062; 1424456061

In this paper, lead-free (Bi 0.5 K 0.5 )TiO 3 ceramics doped with SrTiO 3 was prepared by the conventional solid state reaction method with sintering temperature at 1040°C. The samples were characterized by X-ray diffraction analysis and Scanning Electron Microscopy. The dielectric, ferroelectric properties were also investigated. The results of X-ray diffraction reveal that SrTiO 3 diffuse into the Bi 0.5 K 0.5 TiO 3 lattices to form a solid solution with a pure perovskite structure. After the introduction of SrTiO 3 into Bi 0.5 K 0.5 TiO 3 , the dielectric constant at room temperature (ε r ) was found to decrease with increasing SrTiO 3 . The broadness of the dielectric constant peak was observed with increasing SrTiO 3 content, especially that of the 0.94Bi 0.5 K 0.5 TiO 3 - 0.06 SrTiO 3 ceramic which exhibited a very broad curve over a wide temperature range. The Bi 0.5 K 0.5 TiO 3 - SrTiO 3 system was expected to be a new and promising candidate for lead-free capacitors.