NMR studies of the structure of alkali thioborate glasses

dc.contributor.advisor Steve W. Martin
dc.contributor.author Sills, Julia
dc.contributor.department Materials Science and Engineering
dc.date 2018-08-23T06:09:08.000
dc.date.accessioned 2020-06-30T07:08:12Z
dc.date.available 2020-06-30T07:08:12Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 1993
dc.date.issued 1993
dc.description.abstract <p>The [superscript]11B NMR spectra of high purity xNa[subscript]2S + (1-x)B[subscript]2S[subscript]3 glasses (where 0 ≤ x ≤ 0.8), xK[subscript]2S + (1-x)B[subscript]2S[subscript]3 glasses (where 0 ≤ x ≤ 0.45), and mixed alkali x(Na[subscript]2S:K[subscript]2S) + (1-x) B[subscript]2S[subscript]3 glasses (where 0 ≤ x ≤ 0.25) are reported. The [superscript]11B NMR spectrum of vitreous B[subscript]2S[subscript]3 consists of a quadrupolar broadened single line and confirms a short range order of trigonally coordinated borons. As in the oxide analogs, as alkali sulfide is added, a single narrow peak grows in at the resonance frequency, confirming the existence of highly symmetric tetrahedrally coordinated borons;The fractions of tetrahedral borons that are created in the low alkali region by the addition of Na[subscript]2S to B[subscript]2S[subscript]3 are found to be a factor of three to four times greater at a given composition than those observed in the Na[subscript]2O + B[subscript]2O[subscript]3 system. A structural model has been developed in an attempt to explain these high tetrahedral boron fractions;In the K[subscript]2S + B[subscript]2S[subscript]3 system, tetrahedral boron fractions also found to be a factor of one and one half times greater than those in the K[subscript]2O + B[subscript]2O[subscript]3 system. A structural model has been developed in order to explain this behavior;The mixed alkali glasses are found to contain fractions of tetrahedral borons that fall on the average values of single alkali glasses having the same total alkali content. This is in contrast to alkali borate mixed alkali glasses, in which tetrahedral boron fractions tend to be lower than the average values of the single alkali glasses.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/10859/
dc.identifier.articleid 11858
dc.identifier.contextkey 6418613
dc.identifier.doi https://doi.org/10.31274/rtd-180813-12668
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/10859
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/64051
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/10859/r_9414020.pdf|||Fri Jan 14 18:29:31 UTC 2022
dc.subject.disciplines Inorganic Chemistry
dc.subject.disciplines Materials Science and Engineering
dc.subject.keywords Materials science and engineering
dc.subject.keywords Ceramic engineering
dc.title NMR studies of the structure of alkali thioborate glasses
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication bf9f7e3e-25bd-44d3-b49c-ed98372dee5e
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
Original bundle
Now showing 1 - 1 of 1
No Thumbnail Available
3.02 MB
Adobe Portable Document Format