Title:
Advances in Processing of Transparent Lutetia-Based Ceramics for High Power Laser Applications

dc.contributor.advisor Speyer, Robert F.
dc.contributor.author Eun, Joseph William
dc.contributor.committeeMember Thadhani, Naresh N.
dc.contributor.committeeMember Gokhale, Arun M.
dc.contributor.committeeMember Gerhardt, Rosario A.
dc.contributor.committeeMember Cai, Wenshan
dc.contributor.department Materials Science and Engineering
dc.date.accessioned 2022-05-18T19:32:01Z
dc.date.available 2022-05-18T19:32:01Z
dc.date.created 2022-05
dc.date.issued 2022-04-11
dc.date.submitted May 2022
dc.date.updated 2022-05-18T19:32:01Z
dc.description.abstract Conventional and scalable methods of green-body formation of powder compacts, along with temperature/pressure processing methods, were optimized to sinter Lu2O3 powder compacts to relative densities of 97-98%, with micrometer-sized grains. Post-HIPing at or below sintering temperatures yielded theoretically dense ceramics. A key development was the use of LiF vapor produced adjacent to the compact in the furnace environment, which physisorbed onto particle surfaces of the pre-sintered compact. Lowering grain boundary energy, it acted as a grain growth inhibitor and hence a remarkable sintering aid. An important focus of the work was processing steps which mitigated gap retention between spray dried granules in powder compacts, which ultimately negatively affected transparency. Optical transparency up to 99.1% of theoretical transparency at 1100 nm was achieved. The optimized processing parameters from the undoped work translated well to the development of Yb3+-doped lutetia ceramics. Dopant concentrations of up to 16-mol% Yb3+ were studied. Fully miscible solid-solution of the ytterbia and lutetia were confirmed at all studied dopant concentrations. Transmittance of optimally processed specimens approached theoretical limits and was especially good at the highest doping levels. Photoluminescence measurements implied quenching effects at higher doping levels, which were attenuated after sample thinning.
dc.description.degree Ph.D.
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/66552
dc.language.iso en_US
dc.publisher Georgia Institute of Technology
dc.subject Sintering
dc.subject Transparent
dc.subject Ceramics
dc.subject Lutetia
dc.subject Sesquioxide
dc.subject Ytterbia
dc.subject Ytterbium
dc.title Advances in Processing of Transparent Lutetia-Based Ceramics for High Power Laser Applications
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Speyer, Robert F.
local.contributor.corporatename School of Materials Science and Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication ca7f4d7a-1308-47c2-8dd0-67775f5e3d5a
relation.isOrgUnitOfPublication 21b5a45b-0b8a-4b69-a36b-6556f8426a35
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
thesis.degree.level Doctoral
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
EUN-DISSERTATION-2022.pdf
Size:
128.9 MB
Format:
Adobe Portable Document Format
Description:
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
LICENSE.txt
Size:
3.86 KB
Format:
Plain Text
Description: