B-site vacancy induced Raman scattering in BaTiO3-based ferroelectric ceramics

Vignaswaran K. Veerapandiyan; Saman Khosravi H; Giovanna Canu; Antonio Feteira; Vincenzo Buscaglia; Klaus Reichmann; Marco Deluca

doi:10.1016/j.jeurceramsoc.2020.05.051

B-site vacancy induced Raman scattering in BaTiO₃-based ferroelectric ceramics

Vignaswaran K. Veerapandiyan^*, Saman Khosravi H, Giovanna Canu, Antonio Feteira, Vincenzo Buscaglia, Klaus Reichmann, Marco Deluca

^*Corresponding author for this work

Institute for Chemistry and Technology of Materials (6380)

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

Abstract

Defects, in particular vacancies, play a crucial role in substituted perovskite systems, influencing the structural features that underpin ferroelectricity. B-site vacancies introduce cation disorder in the perovskite lattice and are in fact one of the main driving forces for relaxor behaviour in barium titanate (BaTiO₃, BT) based ferroelectrics. In this work, material systems are carefully selected to qualitatively study the change in B-site vacancy concentration for heterovalent substituted BT-based ferroelectric polycrystals. Raman spectroscopy was used to investigate those systems, and B-site vacancy specific Raman modes were identified unambiguously by comparison with charge-compensated BT, where B-site vacancies are absent. This study validates the hypothesis that vacancies induce Raman scattering because of symmetry breaking in the BT lattice, establishing this method as a vital tool to study substitutional defects in ceramic materials.

Original language	English
Pages (from-to)	4684-4688
Number of pages	5
Journal	Journal of the European Ceramic Society
Volume	40
Issue number	13
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2020.05.051
Publication status	Published - Oct 2020

Keywords

Charge-compensated ceramics
Heterovalent substitution
Lead-free ferroelectrics
Raman spectroscopy
Vacancies

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2020.05.051

Cite this

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title = "B-site vacancy induced Raman scattering in BaTiO3-based ferroelectric ceramics",

abstract = "Defects, in particular vacancies, play a crucial role in substituted perovskite systems, influencing the structural features that underpin ferroelectricity. B-site vacancies introduce cation disorder in the perovskite lattice and are in fact one of the main driving forces for relaxor behaviour in barium titanate (BaTiO3, BT) based ferroelectrics. In this work, material systems are carefully selected to qualitatively study the change in B-site vacancy concentration for heterovalent substituted BT-based ferroelectric polycrystals. Raman spectroscopy was used to investigate those systems, and B-site vacancy specific Raman modes were identified unambiguously by comparison with charge-compensated BT, where B-site vacancies are absent. This study validates the hypothesis that vacancies induce Raman scattering because of symmetry breaking in the BT lattice, establishing this method as a vital tool to study substitutional defects in ceramic materials.",

keywords = "Charge-compensated ceramics, Heterovalent substitution, Lead-free ferroelectrics, Raman spectroscopy, Vacancies",

author = "Veerapandiyan, {Vignaswaran K.} and {Khosravi H}, Saman and Giovanna Canu and Antonio Feteira and Vincenzo Buscaglia and Klaus Reichmann and Marco Deluca",

year = "2020",

month = oct,

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language = "English",

volume = "40",

pages = "4684--4688",

journal = "Journal of the European Ceramic Society",

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T1 - B-site vacancy induced Raman scattering in BaTiO3-based ferroelectric ceramics

AU - Veerapandiyan, Vignaswaran K.

AU - Khosravi H, Saman

AU - Canu, Giovanna

AU - Feteira, Antonio

AU - Buscaglia, Vincenzo

AU - Reichmann, Klaus

AU - Deluca, Marco

PY - 2020/10

Y1 - 2020/10

N2 - Defects, in particular vacancies, play a crucial role in substituted perovskite systems, influencing the structural features that underpin ferroelectricity. B-site vacancies introduce cation disorder in the perovskite lattice and are in fact one of the main driving forces for relaxor behaviour in barium titanate (BaTiO3, BT) based ferroelectrics. In this work, material systems are carefully selected to qualitatively study the change in B-site vacancy concentration for heterovalent substituted BT-based ferroelectric polycrystals. Raman spectroscopy was used to investigate those systems, and B-site vacancy specific Raman modes were identified unambiguously by comparison with charge-compensated BT, where B-site vacancies are absent. This study validates the hypothesis that vacancies induce Raman scattering because of symmetry breaking in the BT lattice, establishing this method as a vital tool to study substitutional defects in ceramic materials.

AB - Defects, in particular vacancies, play a crucial role in substituted perovskite systems, influencing the structural features that underpin ferroelectricity. B-site vacancies introduce cation disorder in the perovskite lattice and are in fact one of the main driving forces for relaxor behaviour in barium titanate (BaTiO3, BT) based ferroelectrics. In this work, material systems are carefully selected to qualitatively study the change in B-site vacancy concentration for heterovalent substituted BT-based ferroelectric polycrystals. Raman spectroscopy was used to investigate those systems, and B-site vacancy specific Raman modes were identified unambiguously by comparison with charge-compensated BT, where B-site vacancies are absent. This study validates the hypothesis that vacancies induce Raman scattering because of symmetry breaking in the BT lattice, establishing this method as a vital tool to study substitutional defects in ceramic materials.

KW - Charge-compensated ceramics

KW - Heterovalent substitution

KW - Lead-free ferroelectrics

KW - Raman spectroscopy

KW - Vacancies

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