High dielectric composition in the system sn-modified (1-x)BaTiO 3-xBa(Cu1/3Nb2/3)O3, x=0.025 for multilayer ceramic capacitors

Deepam Maurya, Cheol Woo Ahn, Shujun Zhang, Shashank Priya

Research output: Contribution to journalArticle

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Abstract

We report the synthesis and characterization of BaTiO3 (BT)-based high dielectric compositions that are promising for Y5V-type multilayer ceramic capacitors. A solid solution with a nominal composition (1-x)BaTiO3-xBa(Cu1/3Nb2/3)O3 (BCN) (x=0, 0.025) was synthesized by conventional mixed oxide route, followed by compositional modification with varying concentration of Sn, as given by the formulation: 0.975 BaTi1-ySnyO3-0.025 Ba(Cu1/3Nb2/3)O3 (y=0.05, 0.06, 0.075, 0.1). Room-temperature (RT) X-ray diffraction patterns showed a decrease in the tetragonality of BT after modifying with BCN (BTBCN). Modifications with Sn lead to a further decrement in tetragonality and the RT structure became cubic at 6.0 at.% doping level. The decrement in tetragonality was accompanied by lowering of Curie temperature (Tc). BTBCN doped with 6 and 7.5 at.% Sn were found to exhibit diffuse phase transition accompanied by a high dielectric constant ≥7000, a low loss tangent ≤1% and a grain size in the submicrometer regime (≤1 μm).

Original languageEnglish (US)
Pages (from-to)1225-1228
Number of pages4
JournalJournal of the American Ceramic Society
Volume93
Issue number5
DOIs
StatePublished - May 1 2010

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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