Unusual Phase Behavior in the Piezoelectric Perovskite System, LixNa1-xNbO3

Martin Peel; Sharon Elizabeth Ashbrook; Philip Lightfoot

doi:10.1021/ic401061t

Unusual Phase Behavior in the Piezoelectric Perovskite System, Li_xNa₁_-xNbO₃

Martin Peel, Sharon Elizabeth Ashbrook, Philip Lightfoot^*

^*Corresponding author for this work

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

Abstract

The system Li_xNa_{1_-x}NbO₃has been studied by using a combination of X-ray and neutron powder diffraction and Na-23 solid-state NMR spectroscopy. For x = 0.05 we confirm a single polar orthorhombic phase. For 0.08 ≤ x ≤ 0.20 phase mixtures of this orthorhombic phase, together with a rhombohedral phase, isostructural with the low-temperature ferroelectric polymorph of NaNbO₃, are observed. The relative fractions of these two phases are shown to be critically dependent on synthetic conditions: the rhombohedral phase is favored by higher annealing temperatures and rapid cooling. We also observe that the orthorhombic phase transforms slowly to the rhombohedral phase on standing in air at ambient temperature. For 0.25 ≤ x ≤ 0.90 two rhombohedral phases coexist, one Na-rich and the other Li-rich. In this region the phase behavior is independent of reaction conditions.

Original language	English
Pages (from-to)	8872-8880
Number of pages	9
Journal	Inorganic Chemistry
Volume	52
Issue number	15
Early online date	16 Jul 2013
DOIs	https://doi.org/10.1021/ic401061t
Publication status	Published - 5 Aug 2013

Keywords

Lead-free piezoceramics
Quantum MAS NMR
Lattice-parameters
Tilted octahedra
Lithium-niobate
Solid-solutions
NANBO3
Temperature
Diffraction
Transitions

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10.1021/ic401061t

peel2014inorganicchem8872
© 2013. American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/ic401061t
Accepted author manuscript, 882 KB

EPSRC Strategic partner projects-applica: Expanding the capability for variable temperature solid-state NMR in St Andrews
Ashbrook, S. E. (PI)
EPSRC
1/08/11 → 30/06/12
Project: Standard
High-Resolution Solid-State NMR: High-Resolution Solid-State NMR in St Andrews: Development and Applications
Ashbrook, S. E. (PI), Morris, R. E. (CoI), Wormald, P. (CoI) & Wright, P. A. (CoI)
EPSRC
1/08/07 → 13/01/11
Project: Standard

Cite this

@article{cdc061f61f8b4bd397ce65bdfe251f02,

title = "Unusual Phase Behavior in the Piezoelectric Perovskite System, LixNa1-xNbO3",

abstract = "The system LixNa1-xNbO3has been studied by using a combination of X-ray and neutron powder diffraction and Na-23 solid-state NMR spectroscopy. For x = 0.05 we confirm a single polar orthorhombic phase. For 0.08 ≤ x ≤ 0.20 phase mixtures of this orthorhombic phase, together with a rhombohedral phase, isostructural with the low-temperature ferroelectric polymorph of NaNbO3, are observed. The relative fractions of these two phases are shown to be critically dependent on synthetic conditions: the rhombohedral phase is favored by higher annealing temperatures and rapid cooling. We also observe that the orthorhombic phase transforms slowly to the rhombohedral phase on standing in air at ambient temperature. For 0.25 ≤ x ≤ 0.90 two rhombohedral phases coexist, one Na-rich and the other Li-rich. In this region the phase behavior is independent of reaction conditions.",

keywords = "Lead-free piezoceramics, Quantum MAS NMR, Lattice-parameters, Tilted octahedra, Lithium-niobate, Solid-solutions, NANBO3, Temperature, Diffraction, Transitions",

author = "Martin Peel and Ashbrook, {Sharon Elizabeth} and Philip Lightfoot",

note = "M.D.P. was supported by an EPSRC DTA studentship. NMR facilities were supported by EPSRC under Grants EP/J501542 and EP/E041825.",

year = "2013",

month = aug,

day = "5",

doi = "10.1021/ic401061t",

language = "English",

volume = "52",

pages = "8872--8880",

journal = "Inorganic Chemistry",

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TY - JOUR

T1 - Unusual Phase Behavior in the Piezoelectric Perovskite System, LixNa1-xNbO3

AU - Peel, Martin

AU - Ashbrook, Sharon Elizabeth

AU - Lightfoot, Philip

N1 - M.D.P. was supported by an EPSRC DTA studentship. NMR facilities were supported by EPSRC under Grants EP/J501542 and EP/E041825.

PY - 2013/8/5

Y1 - 2013/8/5

N2 - The system LixNa1-xNbO3has been studied by using a combination of X-ray and neutron powder diffraction and Na-23 solid-state NMR spectroscopy. For x = 0.05 we confirm a single polar orthorhombic phase. For 0.08 ≤ x ≤ 0.20 phase mixtures of this orthorhombic phase, together with a rhombohedral phase, isostructural with the low-temperature ferroelectric polymorph of NaNbO3, are observed. The relative fractions of these two phases are shown to be critically dependent on synthetic conditions: the rhombohedral phase is favored by higher annealing temperatures and rapid cooling. We also observe that the orthorhombic phase transforms slowly to the rhombohedral phase on standing in air at ambient temperature. For 0.25 ≤ x ≤ 0.90 two rhombohedral phases coexist, one Na-rich and the other Li-rich. In this region the phase behavior is independent of reaction conditions.

AB - The system LixNa1-xNbO3has been studied by using a combination of X-ray and neutron powder diffraction and Na-23 solid-state NMR spectroscopy. For x = 0.05 we confirm a single polar orthorhombic phase. For 0.08 ≤ x ≤ 0.20 phase mixtures of this orthorhombic phase, together with a rhombohedral phase, isostructural with the low-temperature ferroelectric polymorph of NaNbO3, are observed. The relative fractions of these two phases are shown to be critically dependent on synthetic conditions: the rhombohedral phase is favored by higher annealing temperatures and rapid cooling. We also observe that the orthorhombic phase transforms slowly to the rhombohedral phase on standing in air at ambient temperature. For 0.25 ≤ x ≤ 0.90 two rhombohedral phases coexist, one Na-rich and the other Li-rich. In this region the phase behavior is independent of reaction conditions.

KW - Lead-free piezoceramics

KW - Quantum MAS NMR

KW - Lattice-parameters

KW - Tilted octahedra

KW - Lithium-niobate

KW - Solid-solutions

KW - NANBO3

KW - Temperature

KW - Diffraction

KW - Transitions

U2 - 10.1021/ic401061t

DO - 10.1021/ic401061t

M3 - Article

SN - 0020-1669

VL - 52

SP - 8872

EP - 8880

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 15

ER -

Unusual Phase Behavior in the Piezoelectric Perovskite System, LixNa1-xNbO3

Abstract

Keywords

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Projects

EPSRC Strategic partner projects-applica: Expanding the capability for variable temperature solid-state NMR in St Andrews

High-Resolution Solid-State NMR: High-Resolution Solid-State NMR in St Andrews: Development and Applications

Cite this

Unusual Phase Behavior in the Piezoelectric Perovskite System, Li_xNa₁_-xNbO₃