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Electric field effects on densification of TiB2 and BaTiO3

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TitleInfo
Title
Electric field effects on densification of TiB2 and BaTiO3
SubTitle
a time-resolved in-situ energy dispersive x-ray diffraction study
Name (type = personal)
NamePart (type = family)
Ozdemir
NamePart (type = given)
Tevfik Ertugrul
NamePart (type = date)
1984-
DisplayForm
Tevfik Ertugrul Ozdemir
Role
RoleTerm (authority = RULIB)
author
Name (type = personal)
NamePart (type = family)
Tsakalakos
NamePart (type = given)
Thomas
DisplayForm
Thomas Tsakalakos
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
chair
Name (type = personal)
NamePart (type = family)
Klein
NamePart (type = given)
Lisa
DisplayForm
Lisa Klein
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Kear
NamePart (type = given)
Bernard
DisplayForm
Bernard Kear
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Zhong
NamePart (type = given)
Zhong
DisplayForm
Zhong Zhong
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
outside member
Name (type = corporate)
NamePart
Rutgers University
Role
RoleTerm (authority = RULIB)
degree grantor
Name (type = corporate)
NamePart
Graduate School - New Brunswick
Role
RoleTerm (authority = RULIB)
school
TypeOfResource
Text
Genre (authority = marcgt)
theses
OriginInfo
DateCreated (encoding = w3cdtf); (qualifier = exact)
2016
DateOther (qualifier = exact); (type = degree)
2016-01
CopyrightDate (encoding = w3cdtf); (qualifier = exact)
2016
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
Flash sintering is a unique consolidation method of applying an electric field directly on a specimen while heating it. This method results in outstanding densification results at temperature values typically 30-70% less than the conventional sintering temperature and at ultra-short time scales such as 1-2 orders of magnitude smaller than conventional sintering times. This technique has been used on many oxide and non-oxide ceramics and yielded high densification results. This thesis seeks to establish an improved understanding on mass flux phenomena at unit cell scale under an applied dc electric field utilizing energy dispersive x-ray diffraction (EDXRD). Titanium diboride (TiB2) and barium titanate (BaTiO3) were chosen as the materials of interest to investigate the electric field induced densification and phase transformation. Uniaxially cold pressed TiB2 and BaTiO3 particulate matters of ≤ 128 nm and ≤ 100 nm median particle size, respectively, were used. A custom made experimental setup was utilized for in-situ flash sintering experiments. An electric field of chosen amplitude, depending on the electrical properties of the material on which each experiment was carried out, was directly applied on the bulk sample while it was being subjected to thermal field. TiB2 samples showed no densification but oxidation and a phase transformation between already existing oxides in the raw commercial powder even in an inert atmosphere due to its high tendency to oxidation and poor sinterability. All new oxide peaks occurred upon current leakage were found to be of titanium borate (TiBO3). BaTiO3 was found to be more prone to densification compared to TiB2. 92% - 94% ρth was obtained in BaTiO3 pellets based on two different commercial powders as the temperature and sintering time ranging from ~400 °C to ~950 °C and from 24 seconds to ~1.5 minutes, respectively. This material, in addition to consolidation, showed a phase transformation from cubic to tetragonal structure under electric fields smaller than its coercive field. Ultra-high energy polychromatic radiation with photons of as much energy as 200 keV was employed as energy dispersive x-ray diffraction method (EDXRD) to collect data from the body center of each sample with a time interval as short as maximum 4 seconds while the sample was being subjected to thermal and electric fields. Changes in crystal parameters, and hence unit cell volume, were continuously tracked. Therefore, all mass transport phenomena was monitored and recorded with an error of ≤4 seconds. Phase transformations occurred under applied fields were determined by examining EDXRD data. Scanning electron microscope (SEM) and powder x-ray diffraction were also utilized for the characterization of BaTiO3 for continuity and completeness of the analysis on its consolidation.
Subject (authority = RUETD)
Topic
Materials Science and Engineering
Subject (authority = ETD-LCSH)
Topic
Sintering
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_6930
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
1 online resource (x, 126 p. : ill.)
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Tevfik Ertugrul Ozdemir
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
PhysicalLocation (authority = marcorg); (displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier (type = doi)
doi:10.7282/T31Z46GB
Genre (authority = ExL-Esploro)
ETD doctoral
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Rights

RightsDeclaration (ID = rulibRdec0006)
The author owns the copyright to this work.
RightsHolder (type = personal)
Name
FamilyName
Ozdemir
GivenName
Tevfik
MiddleName
Ertugrul
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2015-12-19 22:59:39
AssociatedEntity
Name
Tevfik Ozdemir
Role
Copyright holder
Affiliation
Rutgers University. Graduate School - New Brunswick
AssociatedObject
Type
License
Name
Author Agreement License
Detail
I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
RightsEvent
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2016-01-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2018-01-30
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after January 30th, 2018.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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RULTechMD (ID = TECHNICAL1)
ContentModel
ETD
OperatingSystem (VERSION = 5.1)
windows xp
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