Finite size effects on the ferroelectric phase transition of Bi 3.5La0.5Ti3O12 nano-particles

M. S. Islam; J. Kano; S. Kojima

doi:10.1080/00150191003697062

Finite size effects on the ferroelectric phase transition of Bi _3.5La_0.5Ti₃O₁₂ nano-particles

M. S. Islam, J. Kano, S. Kojima

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

2 Citations (Scopus)

Abstract

The size effects on the successive phase transition of lanthanum doped ferroelectric bismuth titanate Bi_3.5La_0.5Ti ₃O₁₂ (BLT) nano-particles have been investigated. A dielectric anomaly appears around 520°C for all the size of nano-particles, corresponds to the low temperature monoclinic to orthorhombic phase transition that remains unaffected by the decrease of particle size. The optical soft phonons show a considerable broadening due to the reduction of particle size and completely overdamped below 34 nm. These results demonstrate a size induced ferroelectric orthorhombic to paraelectric tetragonal phase transition. It is confirmed by the temperature-dependence of the soft optical phonon that the first order displacive nature of the orthorhombic to tetragonal phase transition is hold even in nano-system.

Original language	English
Pages (from-to)	16-22
Number of pages	7
Journal	Ferroelectrics
Volume	402
Issue number	1
DOIs	https://doi.org/10.1080/00150191003697062
Publication status	Published - 2010
Externally published	Yes
Event	12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18 - Xi'an, China Duration: Aug 23 2009 → Aug 27 2009

Keywords

Layered-ferroelectrics
Nano-particles
Size effects
Soft mode
Successive phase transition

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1080/00150191003697062

Cite this

@article{ab65df74c3804a318f6fe39557f646f7,

title = "Finite size effects on the ferroelectric phase transition of Bi 3.5La0.5Ti3O12 nano-particles",

abstract = "The size effects on the successive phase transition of lanthanum doped ferroelectric bismuth titanate Bi3.5La0.5Ti 3O12 (BLT) nano-particles have been investigated. A dielectric anomaly appears around 520°C for all the size of nano-particles, corresponds to the low temperature monoclinic to orthorhombic phase transition that remains unaffected by the decrease of particle size. The optical soft phonons show a considerable broadening due to the reduction of particle size and completely overdamped below 34 nm. These results demonstrate a size induced ferroelectric orthorhombic to paraelectric tetragonal phase transition. It is confirmed by the temperature-dependence of the soft optical phonon that the first order displacive nature of the orthorhombic to tetragonal phase transition is hold even in nano-system.",

keywords = "Layered-ferroelectrics, Nano-particles, Size effects, Soft mode, Successive phase transition",

author = "Islam, {M. S.} and J. Kano and S. Kojima",

note = "Funding Information: This work is partly supported by Marubun foundation.; 12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18 ; Conference date: 23-08-2009 Through 27-08-2009",

year = "2010",

doi = "10.1080/00150191003697062",

language = "English",

volume = "402",

pages = "16--22",

journal = "Ferroelectrics",

issn = "0015-0193",

publisher = "Taylor and Francis Ltd.",

number = "1",

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TY - JOUR

T1 - Finite size effects on the ferroelectric phase transition of Bi 3.5La0.5Ti3O12 nano-particles

AU - Islam, M. S.

AU - Kano, J.

AU - Kojima, S.

N1 - Funding Information: This work is partly supported by Marubun foundation.

PY - 2010

Y1 - 2010

N2 - The size effects on the successive phase transition of lanthanum doped ferroelectric bismuth titanate Bi3.5La0.5Ti 3O12 (BLT) nano-particles have been investigated. A dielectric anomaly appears around 520°C for all the size of nano-particles, corresponds to the low temperature monoclinic to orthorhombic phase transition that remains unaffected by the decrease of particle size. The optical soft phonons show a considerable broadening due to the reduction of particle size and completely overdamped below 34 nm. These results demonstrate a size induced ferroelectric orthorhombic to paraelectric tetragonal phase transition. It is confirmed by the temperature-dependence of the soft optical phonon that the first order displacive nature of the orthorhombic to tetragonal phase transition is hold even in nano-system.

AB - The size effects on the successive phase transition of lanthanum doped ferroelectric bismuth titanate Bi3.5La0.5Ti 3O12 (BLT) nano-particles have been investigated. A dielectric anomaly appears around 520°C for all the size of nano-particles, corresponds to the low temperature monoclinic to orthorhombic phase transition that remains unaffected by the decrease of particle size. The optical soft phonons show a considerable broadening due to the reduction of particle size and completely overdamped below 34 nm. These results demonstrate a size induced ferroelectric orthorhombic to paraelectric tetragonal phase transition. It is confirmed by the temperature-dependence of the soft optical phonon that the first order displacive nature of the orthorhombic to tetragonal phase transition is hold even in nano-system.

KW - Layered-ferroelectrics

KW - Nano-particles

KW - Size effects

KW - Soft mode

KW - Successive phase transition

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DO - 10.1080/00150191003697062

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JF - Ferroelectrics

IS - 1

T2 - 12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18

Y2 - 23 August 2009 through 27 August 2009

ER -