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Positive Temperature Coefficient Barium Strontium Titanate Synthesis through Sol-Gel Process
Keywords: Sol-Gel, Nanosize, Postive Temperature Coefficient
Semiconducting Ba1-xSrxTiO3(x=0.1,0.2,0.3,0.4 and 0.5) doped with Sb and mixed with boron oxide sintering aid is synthesized through Sol-Gel process. The raw materials used for nanosize powder precursor synthesis are barium acetate (Ba(CCH3OO)2) strontium acetate(Sr(CCH3OO)20.5H2O), titanium isopropoxide(Ti[OCH(CH3)2]3), antimony isopropoxide(Sb[OCH(CH3)2]3) and triethyl borate(B(C2H5O)3 respectively. The XRD, TGA and TEM analysis of the intermediate substances during the Sol-Gel procedure are conducted. It shows that the semiconducting BST with precisely controlled chemical composition can be obtained successfully. It is quite feasible through this process to obtain nanosize semiconducting Barium Strontium Titanate(BST) with different chemical composition and hence different Curie temperature. In addition, the synthesized powder can be sintered at low temperature(1050C) with the addition of B as sintering aid.
Wenzhong Wu, Research Assistant
Florida International University
Miami, Florida

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