Anomalous synchrotron x-ray scattering studies of nanodomains in Pb(Mg1/3Nb2/3)O3

A. Tkachuk; Haydn Chen; P. Zschack; E. Colla

doi:10.1063/1.1324449

Anomalous synchrotron x-ray scattering studies of nanodomains in Pb(Mg_1/3Nb_2/3)O₃

A. Tkachuk, Haydn Chen, P. Zschack, E. Colla

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

A systematic study of the temperature dependence of superlattice reflections in the reciprocal space of a single crystal Pb(Mg_1/3Nb2_2/3)O₃ (PMN) was performed using anomalous x-ray scattering technique. Our studies confirm the existence of the two types of nanoregioris in PMN: a) chemically ordered nanodomains, and h) polar nanodomains formed by short-range correlated ionic displacements. No detailed temperature dependence of these superlattice reflections has been reported in the past. From monitoring the superlatttice reflections corresponding to polar nanodomains (i.e. QJ spots) over the temperature range 15K-800K, we found freezing temperature (T_f) of correlated atomic displacements was near 200 K. In contrast, chemically ordered nanodomains, which give rise to F type superlattice peaks, exhibited spherical shape over the entire temperature interval 15-800 K, This leads us to suspect that chemically ordered regions might be different and independent of polar nanodomains. In this paper we explain the contributions of different atomic displacements to a and F superlattice reflections in PMN. Correlation and competition between Pb displacements and the tilting of oxygen octahedra network are presented to understand the microstructural origin of the relaxor ferroelectric behavior.

Original language	English (US)
Title of host publication	Fundamental Physics of Ferroelectrics 2000
Subtitle of host publication	Aspen Center for Physics Winter Workshop
Editors	Ronald E. Cohen, Richard A. Mewaldt
Publisher	American Institute of Physics Inc.
Pages	136-142
Number of pages	7
ISBN (Electronic)	1563969599
DOIs	https://doi.org/10.1063/1.1324449
State	Published - Sep 12 2000
Externally published	Yes
Event	Aspen Center for Physics Winter Workshop on Fundamental Physics of Ferroelectrics 2000 - Aspen, United States Duration: Feb 13 2000 → Feb 20 2000

Publication series

Name	AIP Conference Proceedings
Volume	535
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Conference

Conference	Aspen Center for Physics Winter Workshop on Fundamental Physics of Ferroelectrics 2000
Country/Territory	United States
City	Aspen
Period	2/13/00 → 2/20/00

ASJC Scopus subject areas

General Physics and Astronomy

Online availability

10.1063/1.1324449

Library availability

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Cite this

Tkachuk, A., Chen, H., Zschack, P., & Colla, E. (2000). Anomalous synchrotron x-ray scattering studies of nanodomains in Pb(Mg_1/3Nb_2/3)O₃. In R. E. Cohen, & R. A. Mewaldt (Eds.), Fundamental Physics of Ferroelectrics 2000: Aspen Center for Physics Winter Workshop (pp. 136-142). (AIP Conference Proceedings; Vol. 535). American Institute of Physics Inc.. https://doi.org/10.1063/1.1324449

Anomalous synchrotron x-ray scattering studies of nanodomains in Pb(Mg_1/3Nb_2/3)O₃. / Tkachuk, A.; Chen, Haydn; Zschack, P. et al.
Fundamental Physics of Ferroelectrics 2000: Aspen Center for Physics Winter Workshop. ed. / Ronald E. Cohen; Richard A. Mewaldt. American Institute of Physics Inc., 2000. p. 136-142 (AIP Conference Proceedings; Vol. 535).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Tkachuk, A, Chen, H, Zschack, P & Colla, E 2000, Anomalous synchrotron x-ray scattering studies of nanodomains in Pb(Mg_1/3Nb_2/3)O₃. in RE Cohen & RA Mewaldt (eds), Fundamental Physics of Ferroelectrics 2000: Aspen Center for Physics Winter Workshop. AIP Conference Proceedings, vol. 535, American Institute of Physics Inc., pp. 136-142, Aspen Center for Physics Winter Workshop on Fundamental Physics of Ferroelectrics 2000, Aspen, United States, 2/13/00. https://doi.org/10.1063/1.1324449

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abstract = "A systematic study of the temperature dependence of superlattice reflections in the reciprocal space of a single crystal Pb(Mg1/3Nb22/3)O3 (PMN) was performed using anomalous x-ray scattering technique. Our studies confirm the existence of the two types of nanoregioris in PMN: a) chemically ordered nanodomains, and h) polar nanodomains formed by short-range correlated ionic displacements. No detailed temperature dependence of these superlattice reflections has been reported in the past. From monitoring the superlatttice reflections corresponding to polar nanodomains (i.e. QJ spots) over the temperature range 15K-800K, we found freezing temperature (Tf) of correlated atomic displacements was near 200 K. In contrast, chemically ordered nanodomains, which give rise to F type superlattice peaks, exhibited spherical shape over the entire temperature interval 15-800 K, This leads us to suspect that chemically ordered regions might be different and independent of polar nanodomains. In this paper we explain the contributions of different atomic displacements to a and F superlattice reflections in PMN. Correlation and competition between Pb displacements and the tilting of oxygen octahedra network are presented to understand the microstructural origin of the relaxor ferroelectric behavior.",

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