Abstract/Details

A dual space refinement of short and intermediate range atomic structure in the relaxor ferroelectric lead(magnesium(1/3)niobium(2/3))oxide


1993 1993

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Abstract (summary)

We have obtained a detailed model of short and intermediate range atomic structure in the relaxor ferroelectric Pb(Mg$\sb{1/3}$Nb$\sb{2/3})$O$\sb3$ (PMN). This model was developed using a dual space refinement technique, exploiting both crystallographic (reciprocal space) analysis and pair-distribution function (real space) analysis of atomic structure. The model structure shows the existence of two structurally different regions. In one region two different oxygen octahedral environments about the B cations form an Fm3m superstructure. In the other, displacements of B cations from the ideal cubic perovskite lattice site are correlated such that the B cation sublattice is nearly cubic. Polar micro-regions of 10A to 16A in size with a net polarization in agreement with experimental measurements of RMS polarization are found in both regions. These structural features may explain the diffuse paraelectric/ferroelectric transition and strong dielectric dispersion observed in PMN. The model structure may also explain observed electron diffraction patterns and high resolution transmission electron microscopy images of PMN.

Indexing (details)


Subject
Materials science;
Public administration
Classification
0794: Materials science
0617: Public administration
Identifier / keyword
Social sciences; Applied sciences; lead magnesium niobate
Title
A dual space refinement of short and intermediate range atomic structure in the relaxor ferroelectric lead(magnesium(1/3)niobium(2/3))oxide
Author
Rosenfeld, Henry David
Number of pages
201
Publication year
1993
Degree date
1993
School code
0175
Source
DAI-B 54/12, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Egami, Takeshi
University/institution
University of Pennsylvania
University location
United States -- Pennsylvania
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9413898
ProQuest document ID
304072205
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/304072205
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