Mixed glass former effect of 0.5 Na2S + 0.5[xSiS2 + (1-x) PS5/2] and 0.67 Na2S + 0.33[xSiS2 + (1-x) PS5/2] glass systems

dc.contributor.advisor Steve W. Martin
dc.contributor.author Watson, Deborah
dc.contributor.department Materials Science and Engineering
dc.date 2018-08-11T19:33:19.000
dc.date.accessioned 2020-06-30T03:09:42Z
dc.date.available 2020-06-30T03:09:42Z
dc.date.copyright Sun Jan 01 00:00:00 UTC 2017
dc.date.embargo 2001-01-01
dc.date.issued 2017-01-01
dc.description.abstract <p>With the growing interest in using renewable energy resources such as wind and solar to generate and harvest electricity, there is a demand to develop new electrical energy storage systems to accommodate the growth. All solid state sodium batteries may be one potential solution for this demand as sodium has a high natural abundance and low cost compared to lithium, making it a great candidate for solid state batteries in large grid scale applications. In order for this goal to be realized, research into electrolyte materials to allow the use of high energy dense sodium metal is imperative.</p> <p>This research studies two mixed glass former yNa2S + (1-y)[xSiS2 + (1-x)PS5/2] systems (y= 0.50 & 0.67) as potential models for glassy electrolytes. The mixed glass former effect is a nonlinear, non-additive change in the physical properties of the glass that may lead to an increase or decrease in the properties. The y = 0.50 system exhibits a negative MGFE in the glass transition temperature (Tg). The structural analysis via Raman, Infrared and 29Si and 31P magic angle spinning nuclear magnetic resonance showed the non-equal sharing of Na+ between the P and Si glass formers in the y = 0.50 where the Na+ preferentially associates with P short range order (SRO) structures over Si SRO structures. The immediate depolymerization is what leads to a minimum in Tg(s). In the y = 0.67 system a weak negative MGFE is observed in the Tg, density while exhibiting a positive MGFE in the ionic conductivity. The SRO of these glasses contain fully depolymerized, non-networking structures and an excess of Na2S which lead to a negative MGFE in these properties.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/etd/16239/
dc.identifier.articleid 7246
dc.identifier.contextkey 11457290
dc.identifier.doi https://doi.org/10.31274/etd-180810-5868
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath etd/16239
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/30422
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/etd/16239/Watson_iastate_0097E_17068.pdf|||Fri Jan 14 20:57:05 UTC 2022
dc.subject.disciplines Materials Science and Engineering
dc.subject.disciplines Mechanics of Materials
dc.subject.keywords Chalcogenide Glasses
dc.subject.keywords Energy Applications
dc.subject.keywords Energy Storage Applications
dc.subject.keywords Glass Electrolytes
dc.subject.keywords Glass Science
dc.subject.keywords Sodium Electrolyte
dc.title Mixed glass former effect of 0.5 Na2S + 0.5[xSiS2 + (1-x) PS5/2] and 0.67 Na2S + 0.33[xSiS2 + (1-x) PS5/2] glass systems
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.discipline Materials Science and Engineering
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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