ORIENTAL JOURNAL OF CHEMISTRY www.orientjchem.org An International Open Access, Peer Reviewed Research Journal ISSN: 0970-020 X CODEN: OJCHEG 2022, Vol. 38, No.(1): Pg. 102-105 This is an Open Access article licensed under a Creative Commons license: Attribution 4.0 International (CC- BY). Published by Oriental Scientifc Publishing Company © 2018 Gadolinium and Thulium Doping to Perovskite Structured Strontium Titanates at Strontium and Titanium Sites RAMANJEET KAUR 1 * and ANAND K TYAGI 2 1 Department of Applied Sciences, SBSSTC, I. K. Gujral Punjab Technical University, Kapurthala, 144603 (Punjab) India. 2 Vice Chancellor, Mahatma Gandhi Kashi Vidyapith, Varanasi (UP) India. *Corresponding author E-mail: ramanjeetgill99@gmail.com, anandktyagi@gmail.com http://dx.doi.org/10.13005/ojc/380112 (Received: June 07, 2021; Accepted: January 01, 2022) AbSTRACT Low temperature sol gel novel technique has been employed, in the work here, to fabricate gadolinium and thulium doped strontium titanates with nominal composition; Sr 1-a Gd a Ti 1-b Tm b O 3-d for various values of ‘a’ and ‘b’. The synthesized ceramics were cubic structured, phase pure, having well developed morphology and desired composition as revealed by XRD and FESEM/ EDX characterization techniques. The electrical and dielectric properties of the prepared samples were studied and various parameters like dielectric constant, loss factor, a c conductivity etc. were determined. Furthermore, these properties enhance with gadolinium and thulium doping at strontium and titanium sites respectively. Keywords: Thulium, Strontium titanates, Perovskite, Gadolinium. INTRODUCTION Nowadays, fuel cells are emerging as a leading technology in the feld of power generation owing to their better effciency and environment friendliness. A fuel cell produces electric current via electrochemical reaction using hydrogen, oxygen as fuels and producing water as by product. Out of various types of fuel cell used nowadays, solid oxide fuel cells (SOFCs) are preferred due to various limitations suffered by counter fuel cells like requirement of pure fuel, expensive catalyst, corrosive electrolyte, high temperature requirement etc 1-2 . Among various conventional materials employed in fabrication of SOFCs i.e. Ni-Cu/YSZ (nickel/copper–yttria stablized zirconia), rare earth doped CeO 2 (ceria), perovskite structured oxides etc. Lanthanum chromites, Strontium titanates etc.; both in pure and derived forms, are leading candidates in perovskite structured oxides 3-4 . The investigation of electrical properties of strontium titanates doped at ‘Sr’ and ‘Ti’ sites reveals the enhancement in the ionic conductivity with doping 5-6 . The doped strontium titanates have been widely employed in fabrication of various components of SOFCs i.e. anode, cathode and electrolytes. These oxides offers many advantages over other materials like high stability in oxygen, brief communication