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Flash sintering of bismuth ferrite in-situ using energy dispersive x-ray diffraction
Descriptive
TitleInfo
Title
Flash sintering of bismuth ferrite in-situ using energy dispersive x-ray diffraction
Name
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Wassel
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Mary Anne
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Mary Anne Wassel
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author
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Tsakalakos
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Thomas
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Thomas Tsakalakos
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Advisory Committee
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chair
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Klein
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Lisa
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Lisa Klein
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Advisory Committee
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internal member
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(type = family)
Mann
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(type = given)
Adrian
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Adrian Mann
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Advisory Committee
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(authority = RULIB)
internal member
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(type = personal)
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(type = family)
Perez-Maqueda
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(type = given)
Luis
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Luis Perez-Maqueda
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Advisory Committee
Role
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(authority = RULIB)
outside member
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NamePart
Rutgers University
Role
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(authority = RULIB)
degree grantor
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School of Graduate Studies
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school
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Text
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theses
OriginInfo
DateCreated
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2018
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2018-10
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2018
Place
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xx
Language
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eng
Abstract
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Bismuth ferrite (BiFeO3, or BFO) is a multiferroic oxide ceramic that has unique properties at the nanoscale level at room temperature. For this reason, it is of great interest to study and implement BFO's properties for use in a variety of applications, including multiferroic memory, spintronics, and photovoltaics. However, BFO is difficult to make in bulk, not only because impurity phases can develop and inhibit its multiferroic properties, but also because the phase transition at 825°C from its ferroelectric to paraelectric state acts against the densification process.
Flash sintering is a relatively new densification technique that takes less time and energy to make bulk ceramics while exposing the sample to a low electric field. In this study, we investigate the feasibility of flash sintering bismuth ferrite at temperatures below 825°C. Densification occurred at furnace temperatures of 500°C and 350°C, much lower than the transition temperature, to approximately 90% of the theoretical density. During this process, it was observed via energy dispersive X-ray diffraction, a rapid characterization technique used to probe crystallography of bulk materials, that anisotropic lattice expansion occurs when BFO is exposed to an electric field, which is not seen in conventional sintering. Estimating sample temperature during flash sintering is a difficult process, and a few methods are discussed. Finally, several theoretical models of flash sintering mechanisms are addressed to aid in understanding of how this technique works.
Flash sintering is a relatively new densification technique that takes less time and energy to make bulk ceramics while exposing the sample to a low electric field. In this study, we investigate the feasibility of flash sintering bismuth ferrite at temperatures below 825°C. Densification occurred at furnace temperatures of 500°C and 350°C, much lower than the transition temperature, to approximately 90% of the theoretical density. During this process, it was observed via energy dispersive X-ray diffraction, a rapid characterization technique used to probe crystallography of bulk materials, that anisotropic lattice expansion occurs when BFO is exposed to an electric field, which is not seen in conventional sintering. Estimating sample temperature during flash sintering is a difficult process, and a few methods are discussed. Finally, several theoretical models of flash sintering mechanisms are addressed to aid in understanding of how this technique works.
Subject
(authority = RUETD)
Topic
Materials Science and Engineering
Subject
(authority = ETD-LCSH)
Topic
Bismuth compounds
Subject
(authority = ETD-LCSH)
Topic
Sintering
RelatedItem
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Title
Rutgers University Electronic Theses and Dissertations
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ETD_9090
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electronic resource
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application/pdf
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text/xml
Extent
1 online resource (68 pages : illustrations)
Note
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Ph.D.
Note
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Includes bibliographical references
Note
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by Mary Anne Wassel
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Title
School of Graduate Studies Electronic Theses and Dissertations
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rucore10001600001
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NjNbRU
Identifier
(type = doi)
doi:10.7282/t3-mxb2-2162
Genre
(authority = ExL-Esploro)
ETD doctoral
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Rights
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The author owns the copyright to this work.
RightsHolder
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Name
FamilyName
Wassel
GivenName
Mary Anne
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime
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(point = start)
2018-07-02 10:27:13
AssociatedEntity
Name
Mary Anne Wassel
Role
Copyright holder
Affiliation
Rutgers University. School of Graduate Studies
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.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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windows xp
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2018-07-05T17:21:28
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2018-07-05T17:21:28
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