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Dielectric and Structural Study of Bi2O3-BaO-CuO Glass Flux Additives Sintered Barium Titanate for Multilayer Capacitor Applications

Gong, Yuxuan
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1368086374

Abstract Details

2013, MS, University of Cincinnati, Engineering and Applied Science: Materials Science.
The lowering of energy costs and concerns with environmental issues in the materials industry have emerged as critical concerns for energy production. Barium Titanate (BT), as a most widely used dielectric material, usually requires high sintering temperatures (~1350° C) to densify the material and maintain its excellent dielectric properties. However, such high sintering temperature, related in particular to barium titanate use in multilayer capacitors (MLC), severely limits the selection of electrode materials, and also leads to electrode materials cation vacancy formation in the barium titanate lattice. These adverse outcomes strongly favor a lowering of the sintering temperature for the barium titanate ceramics. Research in this direction has focused mainly on the use of a variety of low melting point flux systems. However, with the introduction of fluxes to lower the barium titanate ceramic sintering, both the dielectric constant and loss may be lowered to the point of becoming not industrially applicable for MLC type applications. Barium titanate ceramics with Nd and other rare earth elemental doping can yield superior dielectric constant (> 5000) values, but with import limitations and high cost, other localized substitutions must be made to reduce the overall costs. Structure wise, the flux system may hinder the functioning of dopants and affect the formation of core-shell structure. In this study, the author firstly reviewed the recent works on BaTiO3 sintering flux systems and the methodology of flux system mapping has been proposed, applied to the lowering of sintering temperature; as reported a low sintering temperature of 900 °C, the author utilized the particle distribution principle and developed flux-shell structure to meliorate the dielectric properties; with both compromised sintering and dielectric properties, the flux-shell formation mechanism and effect on dopants has been studied; finally an outlook into the future developments of the study has been proposed by the author. Utilization of Dielectric Measurement, TGA/DTA, XRD, FTIR, SEM have put great endeavor on the structure-property relation. Good correlations between flux mapping, developed flux-shell structure and compromised properties were found in this study.
Relva Buchanan, Sc.D. (Committee Chair)
Rodney Roseman, Ph.D. (Committee Member)
Dale Schaefer, Ph.D. (Committee Member)
85 p.
Materials Science
Barium Titanate; Bi2O3 BaO-CuO Glass; Flux shell; Densification;

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Citations

  • Gong, Y. (2013). Dielectric and Structural Study of Bi2O3-BaO-CuO Glass Flux Additives Sintered Barium Titanate for Multilayer Capacitor Applications [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1368086374

    APA Style (7th edition)

  • Gong, Yuxuan. Dielectric and Structural Study of Bi2O3-BaO-CuO Glass Flux Additives Sintered Barium Titanate for Multilayer Capacitor Applications. 2013. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1368086374.

    MLA Style (8th edition)

  • Gong, Yuxuan. "Dielectric and Structural Study of Bi2O3-BaO-CuO Glass Flux Additives Sintered Barium Titanate for Multilayer Capacitor Applications." Master's thesis, University of Cincinnati, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1368086374

    Chicago Manual of Style (17th edition)

ucin1368086374
887
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This open access ETD is published by University of Cincinnati and OhioLINK.