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Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3

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Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3. / Dixon, Charlotte A. L.; McNulty, Jason A.; Huband, Steven; Thomas, Pamela A.; Lightfoot, Philip.

In: International Union of Crystallography Journal (IUCrJ), Vol. 4, No. 3, 05.2017, p. 215-222.

Research output: Contribution to journalArticlepeer-review

Harvard

Dixon, CAL, McNulty, JA, Huband, S, Thomas, PA & Lightfoot, P 2017, 'Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3', International Union of Crystallography Journal (IUCrJ), vol. 4, no. 3, pp. 215-222. https://doi.org/10.1107/S2052252517002226

APA

Dixon, C. A. L., McNulty, J. A., Huband, S., Thomas, P. A., & Lightfoot, P. (2017). Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3. International Union of Crystallography Journal (IUCrJ), 4(3), 215-222. https://doi.org/10.1107/S2052252517002226

Vancouver

Dixon CAL, McNulty JA, Huband S, Thomas PA, Lightfoot P. Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3. International Union of Crystallography Journal (IUCrJ). 2017 May;4(3):215-222. https://doi.org/10.1107/S2052252517002226

Author

Dixon, Charlotte A. L. ; McNulty, Jason A. ; Huband, Steven ; Thomas, Pamela A. ; Lightfoot, Philip. / Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3. In: International Union of Crystallography Journal (IUCrJ). 2017 ; Vol. 4, No. 3. pp. 215-222.

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@article{41b89e22c4a843aabccec6c584751ae5,
title = "Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3",
abstract = "We demonstrate the existence of a novel phase transition sequence in the perovskite Li0.2Na0.8NbO3 at elevated temperature. The rare Glazer tilt system, a+a+c-, is observed in both polar and centrosymmetric polymorphs.The perovskite Li0.2Na0.8NbO3 is shown, by powder neutron diffraction, to display a unique sequence of phase transitions at elevated temperature. The ambient temperature polar phase (rhombohedral, space group R3c) transforms via a first-order transition to a polar tetragonal phase (space group P42mc) in the region 150 – 300 °C; these two phases correspond to Glazer tilt systems a-a-a- and a+a+c-, respectively. At 500 °C a ferroelectric – paraelectric transition takes place from P42mc to P42/nmc, retaining the a+a+c- tilt. Transformation to a single-tilt system, a0a0c+ (space group P4/mbm), occurs at 750 °C, with the final transition to the aristotype cubic phase at 850 °C. The P42mc and P42/nmc phases have each been seen only once previously in perovskite crystallography, in both cases in compositions prepared at high pressure.",
keywords = "Perovskite, Ferroelectric, Powder neutron diffraction",
author = "Dixon, {Charlotte A. L.} and McNulty, {Jason A.} and Steven Huband and Thomas, {Pamela A.} and Philip Lightfoot",
note = "Funding for this research was provided by: EPSRC (award No. EP/L505079/1).",
year = "2017",
month = may,
doi = "10.1107/S2052252517002226",
language = "English",
volume = "4",
pages = "215--222",
journal = "International Union of Crystallography Journal (IUCrJ)",
issn = "2052-2525",
publisher = "International Union of Crystallography",
number = "3",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Unprecedented phase transition sequence in the perovskite Li0.2Na0.8NbO3

AU - Dixon, Charlotte A. L.

AU - McNulty, Jason A.

AU - Huband, Steven

AU - Thomas, Pamela A.

AU - Lightfoot, Philip

N1 - Funding for this research was provided by: EPSRC (award No. EP/L505079/1).

PY - 2017/5

Y1 - 2017/5

N2 - We demonstrate the existence of a novel phase transition sequence in the perovskite Li0.2Na0.8NbO3 at elevated temperature. The rare Glazer tilt system, a+a+c-, is observed in both polar and centrosymmetric polymorphs.The perovskite Li0.2Na0.8NbO3 is shown, by powder neutron diffraction, to display a unique sequence of phase transitions at elevated temperature. The ambient temperature polar phase (rhombohedral, space group R3c) transforms via a first-order transition to a polar tetragonal phase (space group P42mc) in the region 150 – 300 °C; these two phases correspond to Glazer tilt systems a-a-a- and a+a+c-, respectively. At 500 °C a ferroelectric – paraelectric transition takes place from P42mc to P42/nmc, retaining the a+a+c- tilt. Transformation to a single-tilt system, a0a0c+ (space group P4/mbm), occurs at 750 °C, with the final transition to the aristotype cubic phase at 850 °C. The P42mc and P42/nmc phases have each been seen only once previously in perovskite crystallography, in both cases in compositions prepared at high pressure.

AB - We demonstrate the existence of a novel phase transition sequence in the perovskite Li0.2Na0.8NbO3 at elevated temperature. The rare Glazer tilt system, a+a+c-, is observed in both polar and centrosymmetric polymorphs.The perovskite Li0.2Na0.8NbO3 is shown, by powder neutron diffraction, to display a unique sequence of phase transitions at elevated temperature. The ambient temperature polar phase (rhombohedral, space group R3c) transforms via a first-order transition to a polar tetragonal phase (space group P42mc) in the region 150 – 300 °C; these two phases correspond to Glazer tilt systems a-a-a- and a+a+c-, respectively. At 500 °C a ferroelectric – paraelectric transition takes place from P42mc to P42/nmc, retaining the a+a+c- tilt. Transformation to a single-tilt system, a0a0c+ (space group P4/mbm), occurs at 750 °C, with the final transition to the aristotype cubic phase at 850 °C. The P42mc and P42/nmc phases have each been seen only once previously in perovskite crystallography, in both cases in compositions prepared at high pressure.

KW - Perovskite

KW - Ferroelectric

KW - Powder neutron diffraction

U2 - 10.1107/S2052252517002226

DO - 10.1107/S2052252517002226

M3 - Article

VL - 4

SP - 215

EP - 222

JO - International Union of Crystallography Journal (IUCrJ)

JF - International Union of Crystallography Journal (IUCrJ)

SN - 2052-2525

IS - 3

ER -

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