Ordered structure in lead magnoniobate (PMN) by resonant x-ray scattering

Book · Tue Dec 31 04:00:00 EST 1996

OSTI ID:474603

Gosula, V; Chen, H ^[1]; Teslic, S; Egami, T ^[2]; Vakhrushev, S

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1. Univ. of Illinois, Urbana, IL (United States). Dept. of Materials Science and Engineering
2. Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Materials Science and Engineering

Half integer superlattice reflections characteristic of ordered structure in PMN (Pb(Mg{sub 1/3}Nb{sub 2/3})O{sub 3}) single crystal have been measured using resonant synchrotron x-ray scattering near the Pb L{sub III} absorption edge. These superlattice peaks have been previously reported in PMN by electron diffraction, and were interpreted in the context of a two phase Nb/Mg ordering model to explain its relaxor ferroelectric behavior. Nevertheless, the microscopic origin of the superlattice peaks is controversial. Previous results have shown that the Nb atom contributes heavily to the superlattice peaks. However, the effect scattering factor for these peaks is significantly smaller than in the case of complete ordering. In addition, there is strong evidence that lead participates in the ordering.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-91ER45439
• OSTI ID: 474603
• Report Number(s): CONF-960401--; ISBN 1-55899-340-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
LEAD COMPOUNDS
MAGNESIUM OXIDES
NIOBATES
ORDER PARAMETERS
SUPERLATTICES
X-RAY DIFFRACTION