High-pressure Raman study and pressure-reduced phase transitions of sodium niobate NaNbO3

Z. X. Shen; Xianbin Wang; S. H. Tang; M. H. Kuok; R. Malekfar

doi:10.1002/1097-4555(200005)31:5<439::AID-JRS555>3.0.CO;2-8

High-pressure Raman study and pressure-reduced phase transitions of sodium niobate NaNbO₃

Z. X. Shen^*, Xianbin Wang, S. H. Tang, M. H. Kuok, R. Malekfar

^*Corresponding author for this work

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

30 Scopus citations

Abstract

Raman spectroscopic studies have been carried out on antiferroelectric sodium niobate NaNbO₃ under pressures up to 22 GPa. The Raman spectra show a rich variety of changes with pressure and evidence for several phase transitions were observed. A first-order phase transition was found at 7.0 GPa. A low wavenumber mode at 42 cm^-1 appears at 6.0 GPa as a precursor, which softens at higher pressure. This band is obscured above 7.0 GPa after the first order phase transition. Another possible phase transition is proposed at 12 GPa, indicated by the sign change of the gradient of wavenumber-pressure plots for several modes and the disappearance of the Raman band for the strong υ₁ mode. The spectral changes above 6.0 GPa closely resemble those of KNbO₃, and the results are interpreted in comparison with LiNbO₃ and KNbO₃. The high-pressure phase after the first transition at 7.0 GPa may be ferroelectric and the phase above 12 GPa is probably the paraelectric phase. Copyright (C) 2000 John Wiley and Sons, Ltd.

Original language	English (US)
Pages (from-to)	439-443
Number of pages	5
Journal	Journal of Raman Spectroscopy
Volume	31
Issue number	5
DOIs	https://doi.org/10.1002/1097-4555(200005)31:5<439::AID-JRS555>3.0.CO;2-8
State	Published - Dec 18 2000

ASJC Scopus subject areas

Materials Science(all)
Spectroscopy

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10.1002/1097-4555(200005)31:5<439::AID-JRS555>3.0.CO;2-8

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title = "High-pressure Raman study and pressure-reduced phase transitions of sodium niobate NaNbO3",

abstract = "Raman spectroscopic studies have been carried out on antiferroelectric sodium niobate NaNbO3 under pressures up to 22 GPa. The Raman spectra show a rich variety of changes with pressure and evidence for several phase transitions were observed. A first-order phase transition was found at 7.0 GPa. A low wavenumber mode at 42 cm-1 appears at 6.0 GPa as a precursor, which softens at higher pressure. This band is obscured above 7.0 GPa after the first order phase transition. Another possible phase transition is proposed at 12 GPa, indicated by the sign change of the gradient of wavenumber-pressure plots for several modes and the disappearance of the Raman band for the strong υ1 mode. The spectral changes above 6.0 GPa closely resemble those of KNbO3, and the results are interpreted in comparison with LiNbO3 and KNbO3. The high-pressure phase after the first transition at 7.0 GPa may be ferroelectric and the phase above 12 GPa is probably the paraelectric phase. Copyright (C) 2000 John Wiley and Sons, Ltd.",

author = "Shen, {Z. X.} and Xianbin Wang and Tang, {S. H.} and Kuok, {M. H.} and R. Malekfar",

year = "2000",

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doi = "10.1002/1097-4555(200005)31:5<439::AID-JRS555>3.0.CO;2-8",

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TY - JOUR

T1 - High-pressure Raman study and pressure-reduced phase transitions of sodium niobate NaNbO3

AU - Shen, Z. X.

AU - Wang, Xianbin

AU - Tang, S. H.

AU - Kuok, M. H.

AU - Malekfar, R.

PY - 2000/12/18

Y1 - 2000/12/18

N2 - Raman spectroscopic studies have been carried out on antiferroelectric sodium niobate NaNbO3 under pressures up to 22 GPa. The Raman spectra show a rich variety of changes with pressure and evidence for several phase transitions were observed. A first-order phase transition was found at 7.0 GPa. A low wavenumber mode at 42 cm-1 appears at 6.0 GPa as a precursor, which softens at higher pressure. This band is obscured above 7.0 GPa after the first order phase transition. Another possible phase transition is proposed at 12 GPa, indicated by the sign change of the gradient of wavenumber-pressure plots for several modes and the disappearance of the Raman band for the strong υ1 mode. The spectral changes above 6.0 GPa closely resemble those of KNbO3, and the results are interpreted in comparison with LiNbO3 and KNbO3. The high-pressure phase after the first transition at 7.0 GPa may be ferroelectric and the phase above 12 GPa is probably the paraelectric phase. Copyright (C) 2000 John Wiley and Sons, Ltd.

AB - Raman spectroscopic studies have been carried out on antiferroelectric sodium niobate NaNbO3 under pressures up to 22 GPa. The Raman spectra show a rich variety of changes with pressure and evidence for several phase transitions were observed. A first-order phase transition was found at 7.0 GPa. A low wavenumber mode at 42 cm-1 appears at 6.0 GPa as a precursor, which softens at higher pressure. This band is obscured above 7.0 GPa after the first order phase transition. Another possible phase transition is proposed at 12 GPa, indicated by the sign change of the gradient of wavenumber-pressure plots for several modes and the disappearance of the Raman band for the strong υ1 mode. The spectral changes above 6.0 GPa closely resemble those of KNbO3, and the results are interpreted in comparison with LiNbO3 and KNbO3. The high-pressure phase after the first transition at 7.0 GPa may be ferroelectric and the phase above 12 GPa is probably the paraelectric phase. Copyright (C) 2000 John Wiley and Sons, Ltd.

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DO - 10.1002/1097-4555(200005)31:5<439::AID-JRS555>3.0.CO;2-8

M3 - Article

AN - SCOPUS:0033646901

SN - 0377-0486

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JO - Journal of Raman Spectroscopy

JF - Journal of Raman Spectroscopy

IS - 5

ER -

High-pressure Raman study and pressure-reduced phase transitions of sodium niobate NaNbO₃

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