Alfred University Research and Archive (AURA)

The Effects of Excess Sodium and Sintering Parameters on Ionic Conductivity of Zinc Stabilized β"-Alumina

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dc.contributor.advisor Edwards, Doreen Fredell, Anastasia 2017-04-04T01:44:51Z 2017-04-04T01:44:51Z 2015-04
dc.description Advisory committee members: Alastair Cormack, Scott Misture. Dissertation completed in partial fulfillment of the requirements for the degree of Masters of Science in Ceramic Engineering at the Kazuo Inamori School of Engineering, New York State College of Ceramics at Alfred University en_US
dc.description.abstract Sodium β”-alumina is used in batteries due to its high ionic conductivity. This work studied the effect of excess sodium on the grain size, sintering behavior, and ionic conductivity of zinc stabilized β”-alumina. Two compositions, each with varying amounts of excess sodium (molar Na/Al = 0.01 & 0.02), were synthesized and sintered at varying temperatures and times (1610 °C, 1625 °C and 1640 °C; 30 minutes and 1 hour). It was found that grain size and density had the largest influence on ionic resistivity in the materials and that the presence of increased sodium in the composition did not aid in sintering or decrease ionic resistivity. Which factors affect AC impedance spectroscopy, used to measure ionic conductivity in these materials, is not fully understood. The effects of sample thickness and electrode material were evaluated to determine the repeatability of data across these parameters. A connection between these factors was established. Resistivity was determined to be independent of sample thickness; although thinner samples exhibited greater uncertainty in collected data. Additionally, it was determined that of the choice of electrode material did influence collected data. Resistivity and activation energy for samples measured using gold and fluxed platinum electrode could be directly compared to each other, whereas the data collected using unfluxed platinum and carbon electrodes could not; showing that electrode material did affect impedance spectroscopy measurements. en_US
dc.description.sponsorship NYSERDA and GE Global Research en_US
dc.format.extent 79 pages en_US
dc.language.iso en_US en_US
dc.publisher New York State College of Ceramics at Alfred University. Kazuo Inamori School of Engineering. en_US
dc.relation.ispartof Scholes Library en_US
dc.rights.uri en_US
dc.title The Effects of Excess Sodium and Sintering Parameters on Ionic Conductivity of Zinc Stabilized β"-Alumina en_US
dc.type Thesis en_US

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