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Acoustic and electrical properties of bismuth sodium titanate-based materials
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TitleInfo
Title
Acoustic and electrical properties of bismuth sodium titanate-based materials
Name
(type = personal)
NamePart
(type = family)
Hejazi Dehaghani
NamePart
(type = given)
Seyed Mehdi
NamePart
(type = date)
1984-
DisplayForm
Seyed Mehdi Hejazi Dehaghani
Role
RoleTerm
(authority = RULIB)
author
Name
(type = personal)
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Safari
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(type = given)
Ahmad
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Ahmad Safari
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Advisory Committee
Role
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(authority = RULIB)
chair
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(type = family)
Feldman
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Leonard
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Leonard Feldman
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Advisory Committee
Role
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(authority = RULIB)
internal member
Name
(type = personal)
NamePart
(type = family)
Amatucci
NamePart
(type = given)
Glenn
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Glenn Amatucci
Affiliation
Advisory Committee
Role
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(authority = RULIB)
internal member
Name
(type = personal)
NamePart
(type = family)
Chhowalla
NamePart
(type = given)
Manish
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Manish Chhowalla
Affiliation
Advisory Committee
Role
RoleTerm
(authority = RULIB)
internal member
Name
(type = personal)
NamePart
(type = family)
Panda
NamePart
(type = given)
Rajesh
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Rajesh Panda
Affiliation
Advisory Committee
Role
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(authority = RULIB)
outside member
Name
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NamePart
Rutgers University
Role
RoleTerm
(authority = RULIB)
degree grantor
Name
(type = corporate)
NamePart
Graduate School - New Brunswick
Role
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(authority = RULIB)
school
TypeOfResource
Text
Genre
(authority = marcgt)
theses
OriginInfo
DateCreated
(qualifier = exact)
2013
DateOther
(qualifier = exact);
(type = degree)
2013-10
Place
PlaceTerm
(type = code)
xx
Language
LanguageTerm
(authority = ISO639-2b);
(type = code)
eng
Abstract
(type = abstract)
In this research, an attempt has been made to develop and characterize lead-free ceramics, transducers, and thin films based on Bi0.5Na0.5TiO3 (BNT) compositions. BNT-based ceramics with different compositions were prepared by mixed oxide route. The electromechanical and acoustic properties of the ceramics were studied. 0.88BNT-0.08BKT-0.04BT (BNKTBT88) and 0.076BNT-0.20BKT-0.04BLT (BNKLT76) ceramics showed relatively high values of piezoelectric coefficient (d33~170-175 pC.N-1), dielectric constant (850-950), and planar coupling coefficient (kp~0.32-0.37). On the other hand, BNKLT88 ceramics with a rhombohedral structure exhibited high mechanical quality factor (Qm~420). Acceptor dopants such as Mn and Fe were doped in BNKLT88 ceramics. By optimizing the powder processing and sintering temperature, Qm values as high as 900-975 were obtained in 1.5 mol.% Fe or Mn-doped ceramics sintered at 1100 oC. This composition showed the maximum vibration velocity (0.6 m.s-1), minimum heat generation, minimum input power, and the best efficiency among the studied compositions. High frequency ultrasonic transducers for medical imaging were designed and fabricated based on the BNKLT88 ceramics. The focused transducer with a center frequency of 23 MHz, exhibited a -6dB bandwidth and insertion loss of 55% and -32.1 dB, respectively. B-mode images of a wire phantom (30 µm in diameter) were produced by the transducer. BNT-based thin films with four different compositions in BNT-BKT-BT as well as BNT-BKT-BLT systems were deposited on (001)-oriented SrRuO3/SrTiO3 substrates by pulsed laser deposition technique. The effects of deposition parameters on the microstructure, chemical composition, and electrical properties of thin films were evaluated. Under optimized condition, BNKTBT88 thin films exhibited a remnant polarization of about 30 μC.cm-2 and coercive field of 85 kV.cm-1. The dielectric constant and loss tangent at 1 kHz were measured to be 645 and 0.052, respectively. The leakage current of epitaxial BNKTBT88 thin films measured at different temperatures was matched with the Lampert’s triangle bounded by three straight lines of different slopes. It was shown Mn-doping suppressed the leakage current by more than two orders of magnitude. The remnant polarization and dielectric constant (at 10 kHz) of Mn-doped BNKLT76 film deposited at 400 mtorr were measured to be 23 µC.cm-2 and 660, respectively.
Subject
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Topic
Materials Science and Engineering
RelatedItem
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TitleInfo
Title
Rutgers University Electronic Theses and Dissertations
Identifier
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ETD
Identifier
ETD_5089
PhysicalDescription
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electronic resource
InternetMediaType
application/pdf
InternetMediaType
text/xml
Extent
xix, 233 p. : ill.
Note
(type = degree)
Ph.D.
Note
(type = bibliography)
Includes bibliographical references
Note
(type = vita)
Includes vita
Note
(type = statement of responsibility)
by Seyed Mehdi Hejazi Dehaghani
Subject
(authority = ETD-LCSH)
Topic
Bismuth compounds--Properties
Subject
(authority = ETD-LCSH)
Topic
Ferroelectric crystals
RelatedItem
(type = host)
TitleInfo
Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier
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rucore19991600001
Location
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(displayLabel = Rutgers, The State University of New Jersey)
NjNbRU
Identifier
(type = doi)
doi:10.7282/T3TH8JQS
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
Hejazi Dehaghani
GivenName
Seyed Mehdi
Role
Copyright Holder
RightsEvent
Type
Permission or license
DateTime
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(qualifier = exact);
(point = start)
2013-09-30 03:00:51
AssociatedEntity
Name
Seyed Mehdi Hejazi Dehaghani
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.
Copyright
Status
Copyright protected
Availability
Status
Open
Reason
Permission or license
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RULTechMD
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ETD
OperatingSystem
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windows xp
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