Dielectric noise spectroscopy of relaxor ferroelectrics
O'Brien, Kevin Patrick
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https://hdl.handle.net/2142/30803
Description
Title
Dielectric noise spectroscopy of relaxor ferroelectrics
Author(s)
O'Brien, Kevin Patrick
Issue Date
1997
Doctoral Committee Chair(s)
Weissman, Michael B.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
dielectric noise
relaxor ferroelectrics
PLZT(B/65/35)
mesoscopic capacitor
Language
en
Abstract
"This thesis attempts to answer one simple question: are the
dynamics of relaxor ferroelectrics cooperative? To accomplish this task,
we have developed a promising new technique that is excellent at sorting
out the internal dynamics of high dielectric materials. Specifically we
have examined the dynamics of the relaxor ferroelectric material
PLZT(B/65/35) in the ""frozen"" state. A relaxor ferroelectric is a material
which has local ferroelectric order on the 1 Onm scale (nanodomains) but
on longer scales the material is disordered. The nanodomains appear to
go through a freezing transition and it is not known whether this is a
cooperative effect. DNS examines the details of the polarization
fluctuations from a mesoscopic capacitor, our smallest capacitor has an
effective volume of 2x1Q-12cm3, or 107 nanodomains. From the statistical
details, the lack of any non-Gaussian noise in this case, we are able to
set an upper limit on the number of nanodomains that can act
cooperatively in both equilibrium and near equilibrium."
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