X-Ray Scattering Study of the Transition Dynamics in Relaxor Ferroelectric Lead (Magnesium(1/3) Niobium(2/3)) Oxygen(3) (Pmn)
Gosula, Vijaya Reddy
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https://hdl.handle.net/2142/82927
Description
Title
X-Ray Scattering Study of the Transition Dynamics in Relaxor Ferroelectric Lead (Magnesium(1/3) Niobium(2/3)) Oxygen(3) (Pmn)
Author(s)
Gosula, Vijaya Reddy
Issue Date
2000
Doctoral Committee Chair(s)
Chen, Haydn
Department of Study
Materials Science and Engineering
Discipline
Materials Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Materials Science
Language
eng
Abstract
Thermal diffuse scattering measurements were performed at several temperatures. A [011] transverse optic soft mode was determined to exist. The temperature dependence of this phonon mode was carefully studied as the transition is approached, and down to 40 K. The q-dependency of the freezing process was carefully studied, and it was shown that the freezing takes place simultaneously at the zone center (ZC) and zone boundary (ZB). Coupled with results obtained from the SRO peak, these results imply that both ferroelectric and anti-ferroelectric fluctuations are present in the structure. (Abstract shortened by UMI.).
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