X-ray and electron diffraction studies of the structures of pseudo-perovskite compounds lead scandium tantalate (Pb2(Sc,Ta)O6) and lead magnesium tungstate (Pb2(Mg,W)O6)

K Z Baba-Kishi; G Cressey; R J Cernik

doi:10.1107/s0021889892001110

X-ray and electron diffraction studies of the structures of pseudo-perovskite compounds lead scandium tantalate (Pb2(Sc,Ta)O6) and lead magnesium tungstate (Pb2(Mg,W)O6)

K Z Baba-Kishi, G Cressey, R J Cernik

Research output: Contribution to journal › Article › peer-review

Abstract

Electron diffraction patterns, x-ray precision patterns and synchrotron Rietveld powder diffraction profiles were used to study the crystal structure of the pseudo-perovskite compd. Pb2(Sc,Ta)O6 (PST). The results of a Rietveld refinement and single-crystal x-ray precision studies showed that PST has a lower symmetry than the cubic Fm3m in the paraelec. state. The remarkable similarities between the crystal structures of the antiferroelec. Pb2(Mg,W)O6 (PMW) and ferroelec. PST were studied in detail by electron diffraction and it is suggested that PST is a weak or frustrated antiferroelec. oxide. The influence of the degree of structural long-range order on the existence of an antiferroelec. phase transition in PST and PMW is discussed. [on SciFinder(R)]

Original language	English
Pages (from-to)	477-87
Number of pages	389
Journal	J. Appl. Crystallogr.
Volume	25
Issue number	4
DOIs	https://doi.org/10.1107/s0021889892001110
Publication status	Published - 1992

Keywords

Crystal structure (of lead scandium tantalate and lead magnesium tungstate)
Ferroelectricity (transition of, in lead scandium tantalate and lead magnesium tungstate)
lead scandium tantalate structure phase transition
magnesium lead tungstate structure phase transition
ferroelec transition lead scandium tantalate

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10.1107/s0021889892001110

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title = "X-ray and electron diffraction studies of the structures of pseudo-perovskite compounds lead scandium tantalate (Pb2(Sc,Ta)O6) and lead magnesium tungstate (Pb2(Mg,W)O6)",

abstract = "Electron diffraction patterns, x-ray precision patterns and synchrotron Rietveld powder diffraction profiles were used to study the crystal structure of the pseudo-perovskite compd. Pb2(Sc,Ta)O6 (PST). The results of a Rietveld refinement and single-crystal x-ray precision studies showed that PST has a lower symmetry than the cubic Fm3m in the paraelec. state. The remarkable similarities between the crystal structures of the antiferroelec. Pb2(Mg,W)O6 (PMW) and ferroelec. PST were studied in detail by electron diffraction and it is suggested that PST is a weak or frustrated antiferroelec. oxide. The influence of the degree of structural long-range order on the existence of an antiferroelec. phase transition in PST and PMW is discussed. [on SciFinder(R)]",

keywords = "Crystal structure (of lead scandium tantalate and lead magnesium tungstate), Ferroelectricity (transition of, in lead scandium tantalate and lead magnesium tungstate), lead scandium tantalate structure phase transition, magnesium lead tungstate structure phase transition, ferroelec transition lead scandium tantalate",

author = "Baba-Kishi, {K Z} and G Cressey and Cernik, {R J}",

note = "CAN 117:122001 Crystallography and Liquid Crystals 12036-91-8 (Lead scandium tantalum oxide (Pb2ScTaO6)); 14947-06-9 (Lead magnesium tungstate (Pb2MgWO6)) Role: PRP (Properties) (crystal structure and phase transitions in)",

year = "1992",

doi = "10.1107/s0021889892001110",

language = "English",

volume = "25",

pages = "477--87",

journal = "J. Appl. Crystallogr.",

issn = "0021-8898",

publisher = "International Union of Crystallography",

number = "4",

}

TY - JOUR

T1 - X-ray and electron diffraction studies of the structures of pseudo-perovskite compounds lead scandium tantalate (Pb2(Sc,Ta)O6) and lead magnesium tungstate (Pb2(Mg,W)O6)

AU - Baba-Kishi, K Z

AU - Cressey, G

AU - Cernik, R J

N1 - CAN 117:122001 Crystallography and Liquid Crystals 12036-91-8 (Lead scandium tantalum oxide (Pb2ScTaO6)); 14947-06-9 (Lead magnesium tungstate (Pb2MgWO6)) Role: PRP (Properties) (crystal structure and phase transitions in)

PY - 1992

Y1 - 1992

N2 - Electron diffraction patterns, x-ray precision patterns and synchrotron Rietveld powder diffraction profiles were used to study the crystal structure of the pseudo-perovskite compd. Pb2(Sc,Ta)O6 (PST). The results of a Rietveld refinement and single-crystal x-ray precision studies showed that PST has a lower symmetry than the cubic Fm3m in the paraelec. state. The remarkable similarities between the crystal structures of the antiferroelec. Pb2(Mg,W)O6 (PMW) and ferroelec. PST were studied in detail by electron diffraction and it is suggested that PST is a weak or frustrated antiferroelec. oxide. The influence of the degree of structural long-range order on the existence of an antiferroelec. phase transition in PST and PMW is discussed. [on SciFinder(R)]

AB - Electron diffraction patterns, x-ray precision patterns and synchrotron Rietveld powder diffraction profiles were used to study the crystal structure of the pseudo-perovskite compd. Pb2(Sc,Ta)O6 (PST). The results of a Rietveld refinement and single-crystal x-ray precision studies showed that PST has a lower symmetry than the cubic Fm3m in the paraelec. state. The remarkable similarities between the crystal structures of the antiferroelec. Pb2(Mg,W)O6 (PMW) and ferroelec. PST were studied in detail by electron diffraction and it is suggested that PST is a weak or frustrated antiferroelec. oxide. The influence of the degree of structural long-range order on the existence of an antiferroelec. phase transition in PST and PMW is discussed. [on SciFinder(R)]

KW - Crystal structure (of lead scandium tantalate and lead magnesium tungstate)

KW - Ferroelectricity (transition of, in lead scandium tantalate and lead magnesium tungstate)

KW - lead scandium tantalate structure phase transition

KW - magnesium lead tungstate structure phase transition

KW - ferroelec transition lead scandium tantalate

U2 - 10.1107/s0021889892001110

DO - 10.1107/s0021889892001110

M3 - Article

SN - 0021-8898

VL - 25

SP - 477

EP - 487

JO - J. Appl. Crystallogr.

JF - J. Appl. Crystallogr.

IS - 4

ER -

X-ray and electron diffraction studies of the structures of pseudo-perovskite compounds lead scandium tantalate (Pb2(Sc,Ta)O6) and lead magnesium tungstate (Pb2(Mg,W)O6)

Abstract

Keywords

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