Phase transformation and Raman spectra in BaTiO3 nanocrystals

Jian Yu; X. J. Meng; J. L. Sun; G. S. Wang; J. H. Chu

doi:10.1557/proc-718-d10.7

Phase transformation and Raman spectra in BaTiO₃ nanocrystals

Jian Yu^*
, X. J. Meng
, J. L. Sun
, G. S. Wang
, J. H. Chu

^*Corresponding author for this work

CAS - Shanghai Institute of Technical Physics

Research output: Contribution to journal › Conference article › peer-review

6 Scopus citations

Abstract

In this paper, size-induced ferroelectricity weakening, phase transformation, and anomalous lattice expansion are observed in nanocrystalline BaTiO₃ (nc-BaTiO₃) derived by low temperature hydrothermal methods, and they are well understood using the terms of the long-range interaction and its cooperative phenomena altered by particle size in covalent ionic nanocrystals. In cubic nc-BaTiO₃, five modes centered at 186, 254, 308, 512 and 716 cm^-1 are observed Raman active in cubic nanophase, and they are attributed to local rhombohedral distortion breaking inversion-symmetry in cubic nanophase. The 254 and 308 cm^-1 modes are significantly affected not only by the concentration of hydroxyl defects, but also their particular configuration. And the 806 cm^-1 mode is found to be closely associated with OH^- absorbed on grain boundaries.

Original language	English
Pages (from-to)	177-182
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	718
DOIs	https://doi.org/10.1557/proc-718-d10.7
State	Published - 2002
Externally published	Yes
Event	Perovskite Materials - San Francisco, CA, United States Duration: 1 Apr 2002 → 5 Apr 2002

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title = "Phase transformation and Raman spectra in BaTiO3 nanocrystals",

abstract = "In this paper, size-induced ferroelectricity weakening, phase transformation, and anomalous lattice expansion are observed in nanocrystalline BaTiO3 (nc-BaTiO3) derived by low temperature hydrothermal methods, and they are well understood using the terms of the long-range interaction and its cooperative phenomena altered by particle size in covalent ionic nanocrystals. In cubic nc-BaTiO3, five modes centered at 186, 254, 308, 512 and 716 cm-1 are observed Raman active in cubic nanophase, and they are attributed to local rhombohedral distortion breaking inversion-symmetry in cubic nanophase. The 254 and 308 cm-1 modes are significantly affected not only by the concentration of hydroxyl defects, but also their particular configuration. And the 806 cm-1 mode is found to be closely associated with OH- absorbed on grain boundaries.",

author = "Jian Yu and Meng, \{X. J.\} and Sun, \{J. L.\} and Wang, \{G. S.\} and Chu, \{J. H.\}",

year = "2002",

doi = "10.1557/proc-718-d10.7",

language = "英语",

volume = "718",

pages = "177--182",

journal = "Materials Research Society Symposium - Proceedings",

issn = "0272-9172",

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note = "Perovskite Materials ; Conference date: 01-04-2002 Through 05-04-2002",

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TY - JOUR

T1 - Phase transformation and Raman spectra in BaTiO3 nanocrystals

AU - Yu, Jian

AU - Meng, X. J.

AU - Sun, J. L.

AU - Wang, G. S.

AU - Chu, J. H.

PY - 2002

Y1 - 2002

N2 - In this paper, size-induced ferroelectricity weakening, phase transformation, and anomalous lattice expansion are observed in nanocrystalline BaTiO3 (nc-BaTiO3) derived by low temperature hydrothermal methods, and they are well understood using the terms of the long-range interaction and its cooperative phenomena altered by particle size in covalent ionic nanocrystals. In cubic nc-BaTiO3, five modes centered at 186, 254, 308, 512 and 716 cm-1 are observed Raman active in cubic nanophase, and they are attributed to local rhombohedral distortion breaking inversion-symmetry in cubic nanophase. The 254 and 308 cm-1 modes are significantly affected not only by the concentration of hydroxyl defects, but also their particular configuration. And the 806 cm-1 mode is found to be closely associated with OH- absorbed on grain boundaries.

AB - In this paper, size-induced ferroelectricity weakening, phase transformation, and anomalous lattice expansion are observed in nanocrystalline BaTiO3 (nc-BaTiO3) derived by low temperature hydrothermal methods, and they are well understood using the terms of the long-range interaction and its cooperative phenomena altered by particle size in covalent ionic nanocrystals. In cubic nc-BaTiO3, five modes centered at 186, 254, 308, 512 and 716 cm-1 are observed Raman active in cubic nanophase, and they are attributed to local rhombohedral distortion breaking inversion-symmetry in cubic nanophase. The 254 and 308 cm-1 modes are significantly affected not only by the concentration of hydroxyl defects, but also their particular configuration. And the 806 cm-1 mode is found to be closely associated with OH- absorbed on grain boundaries.

UR - https://www.scopus.com/pages/publications/0036451749

U2 - 10.1557/proc-718-d10.7

DO - 10.1557/proc-718-d10.7

M3 - 会议文章

AN - SCOPUS:0036451749

SN - 0272-9172

VL - 718

SP - 177

EP - 182

JO - Materials Research Society Symposium - Proceedings

JF - Materials Research Society Symposium - Proceedings

T2 - Perovskite Materials

Y2 - 1 April 2002 through 5 April 2002

ER -

Phase transformation and Raman spectra in BaTiO₃ nanocrystals

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