Raman spectroscopy study of ferroelectric modes in [001]-oriented 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 single crystals

Mingrong Shen; G. G. Siu; Z. K. Xu; Wenwu Cao

doi:10.1063/1.1948514

Raman spectroscopy study of ferroelectric modes in [001]-oriented 0.67Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ single crystals

Mingrong Shen, G. G. Siu, Z. K. Xu, Wenwu Cao

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Abstract

This work investigates the evolution of micro-Raman spectra of a [001]-oriented 0.67Pb(Mg_1/3Nb_2/3)O₃-0. 33PbTiO₃ single crystal in the temperature range from -120 to 200°C. For a poled sample, the T_lu mode splits into an E mode (remaining at 51 cm^-1) and a new A₁ mode (shifting to 95 cm^-1 at -120°C) at the tetragonal to rhombohedral phase transition (T_c ∼ 70°C), while other modes remain the same. This A₁ mode belongs to the rhombohedral phase. If the sample is depoled, this A₁ mode persists for temperatures much above T _c on heating, implying that local regions with rhombohedral symmetry still exist in the tetragonal phase. The underdevelopment of long-range order in the depoled crystal causes the sample to have typical characteristics of a relaxor while poling will enhance the long-range order to make it into a regular ferroelectric.

Original language	English (US)
Article number	252903
Pages (from-to)	1-3
Number of pages	3
Journal	Applied Physics Letters
Volume	86
Issue number	25
DOIs	https://doi.org/10.1063/1.1948514
State	Published - 2005

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1948514

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title = "Raman spectroscopy study of ferroelectric modes in [001]-oriented 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 single crystals",

abstract = "This work investigates the evolution of micro-Raman spectra of a [001]-oriented 0.67Pb(Mg1/3Nb2/3)O3-0. 33PbTiO3 single crystal in the temperature range from -120 to 200°C. For a poled sample, the Tlu mode splits into an E mode (remaining at 51 cm-1) and a new A1 mode (shifting to 95 cm-1 at -120°C) at the tetragonal to rhombohedral phase transition (Tc ∼ 70°C), while other modes remain the same. This A1 mode belongs to the rhombohedral phase. If the sample is depoled, this A1 mode persists for temperatures much above T c on heating, implying that local regions with rhombohedral symmetry still exist in the tetragonal phase. The underdevelopment of long-range order in the depoled crystal causes the sample to have typical characteristics of a relaxor while poling will enhance the long-range order to make it into a regular ferroelectric.",

author = "Mingrong Shen and Siu, {G. G.} and Xu, {Z. K.} and Wenwu Cao",

note = "Funding Information: This research was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China [Project No. (102104)].",

year = "2005",

doi = "10.1063/1.1948514",

language = "English (US)",

volume = "86",

pages = "1--3",

journal = "Applied Physics Letters",

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publisher = "American Institute of Physics",

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T1 - Raman spectroscopy study of ferroelectric modes in [001]-oriented 0.67Pb(Mg1/3Nb2/3)O3-0.33PbTiO3 single crystals

AU - Shen, Mingrong

AU - Siu, G. G.

AU - Xu, Z. K.

AU - Cao, Wenwu

N1 - Funding Information: This research was fully supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China [Project No. (102104)].

PY - 2005

Y1 - 2005

N2 - This work investigates the evolution of micro-Raman spectra of a [001]-oriented 0.67Pb(Mg1/3Nb2/3)O3-0. 33PbTiO3 single crystal in the temperature range from -120 to 200°C. For a poled sample, the Tlu mode splits into an E mode (remaining at 51 cm-1) and a new A1 mode (shifting to 95 cm-1 at -120°C) at the tetragonal to rhombohedral phase transition (Tc ∼ 70°C), while other modes remain the same. This A1 mode belongs to the rhombohedral phase. If the sample is depoled, this A1 mode persists for temperatures much above T c on heating, implying that local regions with rhombohedral symmetry still exist in the tetragonal phase. The underdevelopment of long-range order in the depoled crystal causes the sample to have typical characteristics of a relaxor while poling will enhance the long-range order to make it into a regular ferroelectric.

AB - This work investigates the evolution of micro-Raman spectra of a [001]-oriented 0.67Pb(Mg1/3Nb2/3)O3-0. 33PbTiO3 single crystal in the temperature range from -120 to 200°C. For a poled sample, the Tlu mode splits into an E mode (remaining at 51 cm-1) and a new A1 mode (shifting to 95 cm-1 at -120°C) at the tetragonal to rhombohedral phase transition (Tc ∼ 70°C), while other modes remain the same. This A1 mode belongs to the rhombohedral phase. If the sample is depoled, this A1 mode persists for temperatures much above T c on heating, implying that local regions with rhombohedral symmetry still exist in the tetragonal phase. The underdevelopment of long-range order in the depoled crystal causes the sample to have typical characteristics of a relaxor while poling will enhance the long-range order to make it into a regular ferroelectric.

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Raman spectroscopy study of ferroelectric modes in [001]-oriented 0.67Pb(Mg_1/3Nb_2/3)O₃-0.33PbTiO₃ single crystals

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