X-Ray Scattering Study of the Transition Dynamics in Relaxor Ferroelectric Lead (Magnesium(1/3) Niobium(2/3)) Oxygen(3) (Pmn)

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.).

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Materials Science and Engineering

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Gosula, Vijaya Reddy

Contributors dc:contributor

• Chen, Haydn

• Engineering, Materials Science

Language dc:language

eng

Identifier

(MiAaPQ)AAI9971084

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/82927