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Electrical Properties of Sr0.7Ba0.3TiO3 Ceramics Doped with Nb2O5, 3Li2O · 2SiO2, and Bi2O3
Authors:Liqin Zhou  Zhihua Jiang  Shuren Zhang
Affiliation:Department of Materials Science and Engineering, University of Electronic Science and Technology of China, Chengdu 610054, People's Republic of China
Abstract:The electrical properties of Sr0.5Ba0.3TiO3 in the presence of Nb2O5 as a donor, 3Li2O · 2SiO2 as a sintering agent, and Bi2O3 as a dopant have been studied. When the compositions of the ceramics were 1 mol Sr0.7Ba0.3TiO3+ 0.5 mol% Nb2O5+ 2 mol% 3Li2O · 2SiO2+ 0.2 mol% Bi2O3, the ceramics were sintered at 1100°C and exhibited the following characteristics: apparent dielectric constant ?, 25000; loss factor tan δ, 2%; insulating resistivity ρj, 1010Ω· cm; variation of dielectric constant with temperature Δ?/? (?25° to +85°C), +10%, ?14%. ? and tan δ show only small changes with frequency. The study shows this ceramic can be used in multilayer technology.
Keywords:titanates  strontium  barium  electrical properties  doping
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