Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li2SrNb2O7

Ritesh Uppuluri, Hirofumi Akamatsu, Arnab Sen Gupta, Huaiyu Wang, Craig M. Brown, Kleyser E. Agueda Lopez, Nasim Alem, Venkatraman Gopalan, Thomas E. Mallouk

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Over the past few years, several studies have reported the existence of polar phases in n = 2 Ruddlesden-Popper layer perovskites by trilinear coupling of oxygen octahedral rotations (OOR) and polar distortions, a phenomenon termed as hybrid improper ferroelectricity. This phenomenon has opened an avenue to expand the available compositions of ferroelectric and piezoelectric layered oxides. In this study, we report a new polar n = 2 Ruddlesden-Popper layered niobate, Li2SrNb2O7, which undergoes a structural transformation to an antipolar phase when cooled to 90 K. This structural transition results from a change in the phase of rotation of the octahedral layers within the perovskite slabs across the interlayers. First-principles calculations predicted that the antipolar Pnam phase would compete with the polar A21am phase and that both would be energetically lower than the previously assigned centrosymmetric Amam phase. This phase transition was experimentally observed by a combination of synchrotron X-ray diffraction, powder neutron diffraction, and electrical and nonlinear optical characterization techniques. The competition between symmetry breaking to yield polar layer perovskites and hybrid improper antiferroelectrics provides new insight into the rational design of antiferroelectric materials that can have applications as electrostatic capacitors for energy storage.

Original languageEnglish (US)
Pages (from-to)4418-4425
Number of pages8
JournalChemistry of Materials
Volume31
Issue number12
DOIs
StatePublished - Jun 25 2019

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Perovskite
Antiferroelectric materials
Ferroelectricity
Neutron diffraction
Synchrotrons
X ray powder diffraction
Energy storage
Oxides
Ferroelectric materials
Electrostatics
Capacitors
Phase transitions
Oxygen
Chemical analysis
perovskite

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

Cite this

Uppuluri, R., Akamatsu, H., Sen Gupta, A., Wang, H., Brown, C. M., Agueda Lopez, K. E., ... Mallouk, T. E. (2019). Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li2SrNb2O7. Chemistry of Materials, 31(12), 4418-4425. https://doi.org/10.1021/acs.chemmater.9b00786
Uppuluri, Ritesh ; Akamatsu, Hirofumi ; Sen Gupta, Arnab ; Wang, Huaiyu ; Brown, Craig M. ; Agueda Lopez, Kleyser E. ; Alem, Nasim ; Gopalan, Venkatraman ; Mallouk, Thomas E. / Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li2SrNb2O7. In: Chemistry of Materials. 2019 ; Vol. 31, No. 12. pp. 4418-4425.
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Uppuluri, R, Akamatsu, H, Sen Gupta, A, Wang, H, Brown, CM, Agueda Lopez, KE, Alem, N, Gopalan, V & Mallouk, TE 2019, 'Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li2SrNb2O7', Chemistry of Materials, vol. 31, no. 12, pp. 4418-4425. https://doi.org/10.1021/acs.chemmater.9b00786

Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li2SrNb2O7. / Uppuluri, Ritesh; Akamatsu, Hirofumi; Sen Gupta, Arnab; Wang, Huaiyu; Brown, Craig M.; Agueda Lopez, Kleyser E.; Alem, Nasim; Gopalan, Venkatraman; Mallouk, Thomas E.

In: Chemistry of Materials, Vol. 31, No. 12, 25.06.2019, p. 4418-4425.

Research output: Contribution to journalArticle

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T1 - Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li2SrNb2O7

AU - Uppuluri, Ritesh

AU - Akamatsu, Hirofumi

AU - Sen Gupta, Arnab

AU - Wang, Huaiyu

AU - Brown, Craig M.

AU - Agueda Lopez, Kleyser E.

AU - Alem, Nasim

AU - Gopalan, Venkatraman

AU - Mallouk, Thomas E.

PY - 2019/6/25

Y1 - 2019/6/25

N2 - Over the past few years, several studies have reported the existence of polar phases in n = 2 Ruddlesden-Popper layer perovskites by trilinear coupling of oxygen octahedral rotations (OOR) and polar distortions, a phenomenon termed as hybrid improper ferroelectricity. This phenomenon has opened an avenue to expand the available compositions of ferroelectric and piezoelectric layered oxides. In this study, we report a new polar n = 2 Ruddlesden-Popper layered niobate, Li2SrNb2O7, which undergoes a structural transformation to an antipolar phase when cooled to 90 K. This structural transition results from a change in the phase of rotation of the octahedral layers within the perovskite slabs across the interlayers. First-principles calculations predicted that the antipolar Pnam phase would compete with the polar A21am phase and that both would be energetically lower than the previously assigned centrosymmetric Amam phase. This phase transition was experimentally observed by a combination of synchrotron X-ray diffraction, powder neutron diffraction, and electrical and nonlinear optical characterization techniques. The competition between symmetry breaking to yield polar layer perovskites and hybrid improper antiferroelectrics provides new insight into the rational design of antiferroelectric materials that can have applications as electrostatic capacitors for energy storage.

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Uppuluri R, Akamatsu H, Sen Gupta A, Wang H, Brown CM, Agueda Lopez KE et al. Competing Polar and Antipolar Structures in the Ruddlesden-Popper Layered Perovskite Li2SrNb2O7. Chemistry of Materials. 2019 Jun 25;31(12):4418-4425. https://doi.org/10.1021/acs.chemmater.9b00786