The role of local non-tetragonal polar displacements in the temperature- and pressure-induced phase transitions in PbTiO3-BiMeO3 ferroelectrics

Irina Margaritescu; Zenghui Liu; Zuo Guang Ye; Boriana Mihailova

doi:10.1038/s41598-024-57765-w

The role of local non-tetragonal polar displacements in the temperature- and pressure-induced phase transitions in PbTiO₃-BiMeO₃ ferroelectrics

Irina Margaritescu
, Zenghui Liu
, Zuo Guang Ye
, Boriana Mihailova

Faculty of Electronic and Information Engineering

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

Abstract

In situ high-pressure/high-temperature Raman-scattering analyses on PbTiO₃, 0.92PbTiO₃-0.08Bi(Zn_0.5Ti_0.5)O₃ and 0.83PbTiO₃-0.17Bi(Mg_0.5Ti_0.5)O₃ single crystals reveal an intensity transfer between the fine-structure components of the A₁(TO) soft mode. The enhancement of the lowest-energy subpeak, which stems from intrinsic local non-tetragonal polar distortions, along with the suppression of the tetragonal A₁(1TO) fundamental mode with increasing pressure and temperature indicates the key role of the local polarization fluctuations in transformation processes and emphasizes the significance of the order-disorder phenomena in both the pressure- and temperature-induced phase transitions of pure PbTiO₃ and its solid solutions with complex perovskites. Moreover, the temperature and pressure evolution of the fraction of the local non-tetragonal polar distortions is highly sensitive to the type of B-site substituent.

Original language	English
Article number	7106
Journal	Scientific Reports
Volume	14
Issue number	1
DOIs	https://doi.org/10.1038/s41598-024-57765-w
State	Published - Dec 2024

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title = "The role of local non-tetragonal polar displacements in the temperature- and pressure-induced phase transitions in PbTiO3-BiMeO3 ferroelectrics",

abstract = "In situ high-pressure/high-temperature Raman-scattering analyses on PbTiO3, 0.92PbTiO3-0.08Bi(Zn0.5Ti0.5)O3 and 0.83PbTiO3-0.17Bi(Mg0.5Ti0.5)O3 single crystals reveal an intensity transfer between the fine-structure components of the A1(TO) soft mode. The enhancement of the lowest-energy subpeak, which stems from intrinsic local non-tetragonal polar distortions, along with the suppression of the tetragonal A1(1TO) fundamental mode with increasing pressure and temperature indicates the key role of the local polarization fluctuations in transformation processes and emphasizes the significance of the order-disorder phenomena in both the pressure- and temperature-induced phase transitions of pure PbTiO3 and its solid solutions with complex perovskites. Moreover, the temperature and pressure evolution of the fraction of the local non-tetragonal polar distortions is highly sensitive to the type of B-site substituent.",

author = "Irina Margaritescu and Zenghui Liu and Ye, \{Zuo Guang\} and Boriana Mihailova",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2024.",

year = "2024",

month = dec,

doi = "10.1038/s41598-024-57765-w",

language = "英语",

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T1 - The role of local non-tetragonal polar displacements in the temperature- and pressure-induced phase transitions in PbTiO3-BiMeO3 ferroelectrics

AU - Margaritescu, Irina

AU - Liu, Zenghui

AU - Ye, Zuo Guang

AU - Mihailova, Boriana

N1 - Publisher Copyright: © The Author(s) 2024.

PY - 2024/12

Y1 - 2024/12

N2 - In situ high-pressure/high-temperature Raman-scattering analyses on PbTiO3, 0.92PbTiO3-0.08Bi(Zn0.5Ti0.5)O3 and 0.83PbTiO3-0.17Bi(Mg0.5Ti0.5)O3 single crystals reveal an intensity transfer between the fine-structure components of the A1(TO) soft mode. The enhancement of the lowest-energy subpeak, which stems from intrinsic local non-tetragonal polar distortions, along with the suppression of the tetragonal A1(1TO) fundamental mode with increasing pressure and temperature indicates the key role of the local polarization fluctuations in transformation processes and emphasizes the significance of the order-disorder phenomena in both the pressure- and temperature-induced phase transitions of pure PbTiO3 and its solid solutions with complex perovskites. Moreover, the temperature and pressure evolution of the fraction of the local non-tetragonal polar distortions is highly sensitive to the type of B-site substituent.

AB - In situ high-pressure/high-temperature Raman-scattering analyses on PbTiO3, 0.92PbTiO3-0.08Bi(Zn0.5Ti0.5)O3 and 0.83PbTiO3-0.17Bi(Mg0.5Ti0.5)O3 single crystals reveal an intensity transfer between the fine-structure components of the A1(TO) soft mode. The enhancement of the lowest-energy subpeak, which stems from intrinsic local non-tetragonal polar distortions, along with the suppression of the tetragonal A1(1TO) fundamental mode with increasing pressure and temperature indicates the key role of the local polarization fluctuations in transformation processes and emphasizes the significance of the order-disorder phenomena in both the pressure- and temperature-induced phase transitions of pure PbTiO3 and its solid solutions with complex perovskites. Moreover, the temperature and pressure evolution of the fraction of the local non-tetragonal polar distortions is highly sensitive to the type of B-site substituent.

UR - https://www.scopus.com/pages/publications/85188547133

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DO - 10.1038/s41598-024-57765-w

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AN - SCOPUS:85188547133

SN - 2045-2322

VL - 14

JO - Scientific Reports

JF - Scientific Reports

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M1 - 7106

ER -

The role of local non-tetragonal polar displacements in the temperature- and pressure-induced phase transitions in PbTiO₃-BiMeO₃ ferroelectrics

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