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

Lebanese American University (LAU - Lebanon)
Université de Bourgogne - Laboratoire Interdisciplinaire Carnot de Bourgogne
Lebanese American University, Department of Natural Sciences

Onderzoeksoutput: Article › Academic › peer review

Samenvatting

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.

Originele taal-2	English
Artikelnummer	116196
Tijdschrift	Materials Science and Engineering: B
Volume	288
DOI's	https://doi.org/10.1016/j.mseb.2022.116196
Status	Published - feb. 2023
Extern gepubliceerd	Ja

Duurzame ontwikkelingsdoelstellingen van de VN

Deze output draagt bij aan de volgende duurzame ontwikkelingsdoelstelling(en)

SDG 09 – Industrie, innovatie en infrastructuur

Keywords

NBT-CT
röntgendiffractie (XRD
Rietveld verfijning
raman-spectroscopie
ferro-elektrisch

Toegang tot document

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
Onderzoeksoutput: 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., mrt. 2019, In: Ceramics International. 45, 4, blz. 4467-4473 7 blz.
Onderzoeksoutput: 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, blz. 2297-2303 7 blz.
Onderzoeksoutput: Article › Academic › peer review

Open Access

1 Attending a conference

ChemAI
Abou Dargham, S. (Attendee)
29 nov. 2024
Activiteit: Attending a conference

Citeer dit

@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 Limited",

}

TY - JOUR

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

Samenvatting

Duurzame ontwikkelingsdoelstellingen van de VN

Keywords

Toegang tot document

Vingerafdruk

Onderzoekersoutput

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

Activiteiten

ChemAI

Citeer dit