Evidence of a stable tetragonal (P4bm) phase in rhombohedral (R3c) complex perovskite (Na1/2Bi1/2)1-xCaxTiO3 lead-free piezoelectric materials

Roy Roukos; Jimmy Romanos; Sara  Abou Dargham; Denis Chaumont

doi:10.1016/j.mseb.2022.116196

Evidence of a stable tetragonal (P4bm) phase in rhombohedral (R3c) complex perovskite (Na1/2Bi1/2)1-xCaxTiO3 lead-free piezoelectric materials

Roy Roukos, Jimmy Romanos, Sara Abou Dargham, Denis Chaumont

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

Abstract

The room temperature crystal structure and phase evolution of Ca-substituted Na1/2Bi1/2TiO3 (NBCT) at A-site were investigated systematically using X-ray diffraction (XRD) combined with Raman spectroscopy. While XRD patterns of calcined powders exhibited the expected rhombohedral (R3c) phase at room temperature due to low Ca concentration, the corresponding sintered samples displayed peak splitting for all Bragg peaks, appearing as shoulders for all studied compositions. This departure from the average rhombohedral (R3c) to a non-rhombohedral structure is an indication of a new phase evolution of this system. The optimal Rietveld refinement corresponds to the coexistence of two phases, rhombohedral and tetragonal (R3c+P4bm) in the equilibrium state at room temperature. The proposed model describes the growth of a stable high-temperature tetragonal (P4bm) phase within the rhombohedral (R3c) matrix at room temperature. This work is the first XRD macroscale detection of a stable tetragonal (P4bm) phase in rhombohedral complex perovskite at room temperature.

Original language	English
Article number	116196
Journal	Materials Science and Engineering: B
Volume	288
DOIs	https://doi.org/10.1016/j.mseb.2022.116196
Publication status	Published - Feb 2023
Externally published	Yes

Keywords

NBT-CT
x-ray diffraction (XRD)
Rietveld refinement
raman spectroscopy
ferroelectric

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10.1016/j.mseb.2022.116196

3 Article

Detection of morphotropic phase boundary in A-site/Ca-substituted Na0. 5Bi0. 5TiO3 complex oxides ferroelectric system
Roukos, R., Abou Dargham, S., Romanos, J. & Chaumont, D., 2020, In: Journal of Alloys and Compounds. 840
Research output: Contribution to journal › Article › Academic › peer-review

Open Access
Complex structural contribution of the morphotropic phase boundary in Na0. 5Bi0. 5TiO3-CaTiO3 system
Roukos, R., Abou Dargham, S., Romanos, J. & Chaumont, D., Mar 2019, In: Ceramics International. 45, 4, p. 4467-4473 7 p.
Research output: Contribution to journal › Article › Academic › peer-review

Open Access
Quantification of relaxor behavior in (1− x) Na0. 5Bi0. 5TiO3–xCaTiO3 lead-free ceramics system
Roukos, R., Romanos, J., Abou Dargham, S. & Chaumont, D., Jul 2019, In: Journal of the European Ceramic Society. 39, 7, p. 2297-2303 7 p.
Research output: Contribution to journal › Article › Academic › peer-review

Open Access

Cite this

@article{83384299bebd49a0b88f160b58c0ca26,

title = "Evidence of a stable tetragonal (P4bm) phase in rhombohedral (R3c) complex perovskite (Na1/2Bi1/2)1-xCaxTiO3 lead-free piezoelectric materials",

abstract = "The room temperature crystal structure and phase evolution of Ca-substituted Na1/2Bi1/2TiO3 (NBCT) at A-site were investigated systematically using X-ray diffraction (XRD) combined with Raman spectroscopy. While XRD patterns of calcined powders exhibited the expected rhombohedral (R3c) phase at room temperature due to low Ca concentration, the corresponding sintered samples displayed peak splitting for all Bragg peaks, appearing as shoulders for all studied compositions. This departure from the average rhombohedral (R3c) to a non-rhombohedral structure is an indication of a new phase evolution of this system. The optimal Rietveld refinement corresponds to the coexistence of two phases, rhombohedral and tetragonal (R3c+P4bm) in the equilibrium state at room temperature. The proposed model describes the growth of a stable high-temperature tetragonal (P4bm) phase within the rhombohedral (R3c) matrix at room temperature. This work is the first XRD macroscale detection of a stable tetragonal (P4bm) phase in rhombohedral complex perovskite at room temperature.",

keywords = "NBT-CT, r{\"o}ntgendiffractie (XRD, Rietveld verfijning, raman-spectroscopie, ferro-elektrisch, NBT-CT, x-ray diffraction (XRD), Rietveld refinement, raman spectroscopy, ferroelectric",

author = "Roy Roukos and Jimmy Romanos and {Abou Dargham}, Sara and Denis Chaumont",

year = "2023",

month = feb,

doi = "10.1016/j.mseb.2022.116196",

language = "English",

volume = "288",

journal = "Materials Science and Engineering: B",

publisher = "Elsevier",

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T1 - Evidence of a stable tetragonal (P4bm) phase in rhombohedral (R3c) complex perovskite (Na1/2Bi1/2)1-xCaxTiO3 lead-free piezoelectric materials

AU - Roukos, Roy

AU - Romanos, Jimmy

AU - Abou Dargham, Sara

AU - Chaumont, Denis

PY - 2023/2

Y1 - 2023/2

N2 - The room temperature crystal structure and phase evolution of Ca-substituted Na1/2Bi1/2TiO3 (NBCT) at A-site were investigated systematically using X-ray diffraction (XRD) combined with Raman spectroscopy. While XRD patterns of calcined powders exhibited the expected rhombohedral (R3c) phase at room temperature due to low Ca concentration, the corresponding sintered samples displayed peak splitting for all Bragg peaks, appearing as shoulders for all studied compositions. This departure from the average rhombohedral (R3c) to a non-rhombohedral structure is an indication of a new phase evolution of this system. The optimal Rietveld refinement corresponds to the coexistence of two phases, rhombohedral and tetragonal (R3c+P4bm) in the equilibrium state at room temperature. The proposed model describes the growth of a stable high-temperature tetragonal (P4bm) phase within the rhombohedral (R3c) matrix at room temperature. This work is the first XRD macroscale detection of a stable tetragonal (P4bm) phase in rhombohedral complex perovskite at room temperature.

AB - The room temperature crystal structure and phase evolution of Ca-substituted Na1/2Bi1/2TiO3 (NBCT) at A-site were investigated systematically using X-ray diffraction (XRD) combined with Raman spectroscopy. While XRD patterns of calcined powders exhibited the expected rhombohedral (R3c) phase at room temperature due to low Ca concentration, the corresponding sintered samples displayed peak splitting for all Bragg peaks, appearing as shoulders for all studied compositions. This departure from the average rhombohedral (R3c) to a non-rhombohedral structure is an indication of a new phase evolution of this system. The optimal Rietveld refinement corresponds to the coexistence of two phases, rhombohedral and tetragonal (R3c+P4bm) in the equilibrium state at room temperature. The proposed model describes the growth of a stable high-temperature tetragonal (P4bm) phase within the rhombohedral (R3c) matrix at room temperature. This work is the first XRD macroscale detection of a stable tetragonal (P4bm) phase in rhombohedral complex perovskite at room temperature.

KW - NBT-CT

KW - röntgendiffractie (XRD

KW - Rietveld verfijning

KW - raman-spectroscopie

KW - ferro-elektrisch

KW - NBT-CT

KW - x-ray diffraction (XRD)

KW - Rietveld refinement

KW - raman spectroscopy

KW - ferroelectric

U2 - 10.1016/j.mseb.2022.116196

DO - 10.1016/j.mseb.2022.116196

M3 - Article

VL - 288

JO - Materials Science and Engineering: B

JF - Materials Science and Engineering: B

M1 - 116196

ER -

Evidence of a stable tetragonal (P4bm) phase in rhombohedral (R3c) complex perovskite (Na1/2Bi1/2)1-xCaxTiO3 lead-free piezoelectric materials

Abstract

Keywords

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Research output

Detection of morphotropic phase boundary in A-site/Ca-substituted Na0. 5Bi0. 5TiO3 complex oxides ferroelectric system

Complex structural contribution of the morphotropic phase boundary in Na0. 5Bi0. 5TiO3-CaTiO3 system

Quantification of relaxor behavior in (1− x) Na0. 5Bi0. 5TiO3–xCaTiO3 lead-free ceramics system

Cite this