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High pressure phase transformations in polycrystalline yttrium oxide

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TitleInfo
Title
High pressure phase transformations in polycrystalline yttrium oxide
Name (type = personal)
NamePart (type = family)
Deutsch
NamePart (type = given)
Stuart
NamePart (type = date)
1983-
DisplayForm
Stuart Deutsch
Role
RoleTerm (authority = RULIB)
author
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NamePart (type = family)
Kear
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Bernard H
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Bernard H Kear
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Advisory Committee
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chair
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Tse
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Stephen D
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Stephen D Tse
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Advisory Committee
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internal member
Name (type = personal)
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KLEIN
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LISA C
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LISA C KLEIN
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Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Tsakalakos
NamePart (type = given)
Thomas
DisplayForm
Thomas Tsakalakos
Affiliation
Advisory Committee
Role
RoleTerm (authority = RULIB)
internal member
Name (type = personal)
NamePart (type = family)
Voronov
NamePart (type = given)
Oleg A
DisplayForm
Oleg A Voronov
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 (qualifier = exact)
2012
DateOther (qualifier = exact); (type = degree)
2012-10
Place
PlaceTerm (type = code)
xx
Language
LanguageTerm (authority = ISO639-2b); (type = code)
eng
Abstract (type = abstract)
Numerous studies have been performed on high-pressure/high temperature phase transitions in rare-earth sesquioxides. Most of these studies were performed using diamond-anvil presses, which limits the size of samples that can be processed. Hence, studies of microstructural and properties changes accompanying phase transitions have been largely neglected. The purpose of this study has been to fill this gap, working with polycrystalline cubic-Y2O3 because of its importance in IR window and dome applications. We selected Diamond Materials Inc. as partner in this investigation, since this company has the expertise to make test pieces under well-controlled HPHT-processing conditions, thus ensuring that the results obtained for one batch of samples to the next are reproducible. This turned out to be crucial, since variations in applied pressure (1.0 to 8.0 GPa range), and holding times (seconds to hours), resulted in significant changes in observed micro/nano-structures. The temperature was fixed at 1000°C in order to limit HPHT-processing variables to pressure and holding time. In view of the results reported here, it now seems clear that extending the investigation to higher temperatures and lower pressures would be productive. The principal accomplishments of this research are as follows: (1) optimization of a reversible-phase transformation process to convert polycrystalline cubic-Y2O3 into the nanocrystalline state, involving a forward-phase transformation from cubic-to-monoclinic (c-to-m) Y2O3 at a high pressure (8.0 GPa) followed by a reverse-phase transformation from monoclinic-to-cubic (m-to-c) Y2O3 at a lower pressure (1.0 GPa); (2) discovery of a transformation-induced crystallization process to convert polycrystalline c-Y2O3 into columnar-grained m-Y2O3, and possibly into single-crystal m-Y2O3 - the driving force is attributed to a pressure-induced phase transformation that occurs at the tips of the growing columnar-grains; (3) formation of a mixed-phase (c-Y2O3/m-Y2O3) nanocomposite due to incomplete reverse transformation from m-to-c Y2O3 - a near 50:50 nanocomposite displays the highest hardness; and (4) insight into infiltration of carbon-containing gases (e.g. CO, CO2), formed via reactions between carbon heater and entrapped gases (e.g. O2, H2O) in the pressure cell, into cracked grain boundaries to form carbon particles/films via a vapor-deposition mechanism, and into uncracked grain boundaries to form carbon-rich species via a boundary-diffusion mechanism.
Subject (authority = RUETD)
Topic
Materials Science and Engineering
RelatedItem (type = host)
TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier (type = RULIB)
ETD
Identifier
ETD_4242
PhysicalDescription
Form (authority = gmd)
electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
xv, 171 p. : ill.
Note (type = degree)
Ph.D.
Note (type = bibliography)
Includes bibliographical references
Note (type = statement of responsibility)
by Stuart Deutsch
Subject (authority = ETD-LCSH)
Topic
Polycrystals
Subject (authority = ETD-LCSH)
Topic
High pressure (Science)--Research
Subject (authority = ETD-LCSH)
Topic
High pressure (Technology)
Identifier (type = hdl)
http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000066722
RelatedItem (type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier (type = local)
rucore19991600001
Location
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NjNbRU
Identifier (type = doi)
doi:10.7282/T3KK99K0
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
Deutsch
GivenName
Stuart
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime (encoding = w3cdtf); (qualifier = exact); (point = start)
2012-09-16 12:55:03
AssociatedEntity
Name
Stuart Deutsch
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)
2012-10-31
DateTime (encoding = w3cdtf); (qualifier = exact); (point = end)
2013-05-02
Type
Embargo
Detail
Access to this PDF has been restricted at the author's request. It will be publicly available after May 2nd, 2013.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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