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Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4

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Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4. / Howieson, Grant William; Wu, Shitao; Gibbs, Alexandra S; Zhou, Wuzong; Scott, James Floyd; Morrison, Finlay D.

In: Advanced Functional Materials, Vol. 30, No. 45, 2004667, 04.11.2020.

Research output: Contribution to journalArticle

Harvard

Howieson, GW, Wu, S, Gibbs, AS, Zhou, W, Scott, JF & Morrison, FD 2020, 'Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4', Advanced Functional Materials, vol. 30, no. 45, 2004667. https://doi.org/10.1002/adfm.202004667

APA

Howieson, G. W., Wu, S., Gibbs, A. S., Zhou, W., Scott, J. F., & Morrison, F. D. (2020). Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4. Advanced Functional Materials, 30(45), [2004667]. https://doi.org/10.1002/adfm.202004667

Vancouver

Howieson GW, Wu S, Gibbs AS, Zhou W, Scott JF, Morrison FD. Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4. Advanced Functional Materials. 2020 Nov 4;30(45). 2004667. https://doi.org/10.1002/adfm.202004667

Author

Howieson, Grant William ; Wu, Shitao ; Gibbs, Alexandra S ; Zhou, Wuzong ; Scott, James Floyd ; Morrison, Finlay D. / Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4. In: Advanced Functional Materials. 2020 ; Vol. 30, No. 45.

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@article{bbb55d70274b4dbd9e01f83724e271d5,
title = "Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4",
abstract = "The layered perovskite LaTaO4 has been synthesized to be stable in both (polar) orthorhombic and (nonpolar) monoclinic polymorphs at ambient conditions. Although the structural transition between monoclinic and orthorhombic phases has been well established, there is some controversy regarding a further, unidentified transition around 500 K. Here this is identified as an incommensurate–commensurate first‐order transition between incommensurate Cmc21(α00)0s0 and commensurate Cmc21 orthorhombic phases. Transmission electron microscopy indicates partially ordered stacking of different structural units in a, identifying the local cause for the modulation, whereas variable temperature powder neutron diffraction has shown the overall macroscopic modulation vector, q ≈ (0.456, 0, 0)—roughly a 2.2 × expansion in a, corresponding to an approximate 11a commensurate superunit cell dimension. The modulation shows a continuous temperature dependence until transitioning to the basic (commensurate) cell at TIC‐C. Doping the interlayer La sites with smaller Nd cations stabilizes the incommensuration to higher temperature, suggesting the modulation is geometrically driven at the A site.",
keywords = "Dielectrics, Ferroics, Structure-property relationships",
author = "Howieson, {Grant William} and Shitao Wu and Gibbs, {Alexandra S} and Wuzong Zhou and Scott, {James Floyd} and Morrison, {Finlay D.}",
note = "Funding: UK Engineering and Physical Sciences Research Council (Grant Number(s): EP/P022637/1, EP/K503162/1), Science and Technology Facilities Council (Grant Number(s): RB1820307), China Scholarship Council (CN).",
year = "2020",
month = nov,
day = "4",
doi = "10.1002/adfm.202004667",
language = "English",
volume = "30",
journal = "Advanced Functional Materials",
issn = "1616-301X",
publisher = "John Wiley & Sons, Ltd.",
number = "45",

}

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TY - JOUR

T1 - Incommensurate-commensurate transition in the geometric ferroelectric LaTaO4

AU - Howieson, Grant William

AU - Wu, Shitao

AU - Gibbs, Alexandra S

AU - Zhou, Wuzong

AU - Scott, James Floyd

AU - Morrison, Finlay D.

N1 - Funding: UK Engineering and Physical Sciences Research Council (Grant Number(s): EP/P022637/1, EP/K503162/1), Science and Technology Facilities Council (Grant Number(s): RB1820307), China Scholarship Council (CN).

PY - 2020/11/4

Y1 - 2020/11/4

N2 - The layered perovskite LaTaO4 has been synthesized to be stable in both (polar) orthorhombic and (nonpolar) monoclinic polymorphs at ambient conditions. Although the structural transition between monoclinic and orthorhombic phases has been well established, there is some controversy regarding a further, unidentified transition around 500 K. Here this is identified as an incommensurate–commensurate first‐order transition between incommensurate Cmc21(α00)0s0 and commensurate Cmc21 orthorhombic phases. Transmission electron microscopy indicates partially ordered stacking of different structural units in a, identifying the local cause for the modulation, whereas variable temperature powder neutron diffraction has shown the overall macroscopic modulation vector, q ≈ (0.456, 0, 0)—roughly a 2.2 × expansion in a, corresponding to an approximate 11a commensurate superunit cell dimension. The modulation shows a continuous temperature dependence until transitioning to the basic (commensurate) cell at TIC‐C. Doping the interlayer La sites with smaller Nd cations stabilizes the incommensuration to higher temperature, suggesting the modulation is geometrically driven at the A site.

AB - The layered perovskite LaTaO4 has been synthesized to be stable in both (polar) orthorhombic and (nonpolar) monoclinic polymorphs at ambient conditions. Although the structural transition between monoclinic and orthorhombic phases has been well established, there is some controversy regarding a further, unidentified transition around 500 K. Here this is identified as an incommensurate–commensurate first‐order transition between incommensurate Cmc21(α00)0s0 and commensurate Cmc21 orthorhombic phases. Transmission electron microscopy indicates partially ordered stacking of different structural units in a, identifying the local cause for the modulation, whereas variable temperature powder neutron diffraction has shown the overall macroscopic modulation vector, q ≈ (0.456, 0, 0)—roughly a 2.2 × expansion in a, corresponding to an approximate 11a commensurate superunit cell dimension. The modulation shows a continuous temperature dependence until transitioning to the basic (commensurate) cell at TIC‐C. Doping the interlayer La sites with smaller Nd cations stabilizes the incommensuration to higher temperature, suggesting the modulation is geometrically driven at the A site.

KW - Dielectrics

KW - Ferroics

KW - Structure-property relationships

UR - https://onlinelibrary.wiley.com/doi/10.1002/adfm.202004667

U2 - 10.1002/adfm.202004667

DO - 10.1002/adfm.202004667

M3 - Article

VL - 30

JO - Advanced Functional Materials

JF - Advanced Functional Materials

SN - 1616-301X

IS - 45

M1 - 2004667

ER -

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