Modulated Structure of La1/3−xLi3xNbO3 0≤x≤0.06 Perovskite-Related Materials

García-Martín, Susana; Alario-Franco, M.Á.

doi:10.1006/jssc.1999.8377

Cited by 39 publications

(45 citation statements)

References 25 publications

(14 reference statements)

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“…S4 †). 16,17,[21][22][23][24][25][26] All these features were observed in our LNO and LLNO samples. In fact, the cross-like reections were also observed in similarly modulated A-cation decient perovskite-related phases, such as ThNbO 3 (ref.…”

Section: Composition and Crystal Symmetrysupporting

confidence: 65%

“…16,17,[21][22][23][24] However, the origin of these reections is still a matter of controversy. [24][25][26] One feature these explanations have in common is that the local structures in these perovskites can deviate greatly from the average structures derived from XRD and ND measurements. [24][25][26] One feature these explanations have in common is that the local structures in these perovskites can deviate greatly from the average structures derived from XRD and ND measurements.…”

Section: Introductionmentioning

confidence: 99%

“…20 Previous studies have shown that these materials produce complex satellite reections in selected area electron diffraction (SAED) patterns. 16,17,[21][22][23][24] However, the origin of these reections is still a matter of controversy. Various interpretations have been suggested, including formation of nanodomains, 20 microdomains, 16,[21][22][23] unidentied sub-superstructures, 17 and the combined effects of crystal structure modulation, octahedral tilting, structural vacancies, and/or the formation of microdomains.…”

Section: Introductionmentioning

confidence: 99%

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Cation ordering in A-site-deficient Li-ion conducting perovskites La_(1−x)/3Li_xNbO₃

et al. 2015

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Cation-deficient perovskites exhibit complex local atomic arrangements which cannot be adequately described by average crystal structure models. By combining reciprocal-space electron diffraction analysis and direct observations of atom positions using state-of-the-art scanning transmission electron microscopy, we clarify the nature of the cation ordering within A-site-deficient perovskite single crystals of La (1Àx)/3 Li x NbO 3 (x ¼ 0 and x ¼ 0.04). Both materials are found to have complex modulated crystal structures with two types of A-cation ordering, namely a long-range layer ordering in alternate (001) p planes and a short-range (intra-domain) columnar ordering within La-rich (001) p layers. The columnar ordering (occupational modulation) produces modulated displacements of Nb and O atoms. It is also found that substitution of even a small amount of Li for La can affect significantly the columnar ordering, leading to a series of structural and microstructural changes that are likely to have a deleterious effect on the Li-ion conductivity of this material.

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Section: Composition and Crystal Symmetrysupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cation ordering in A-site-deficient Li-ion conducting perovskites La_(1−x)/3Li_xNbO₃

et al. 2015

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“…Besides reections of the doubled unit-cell, some tiny reections detected in 35-45 2q region, supports the existence of larger super-lattices deduced by TEM. 24 In that study, octahedral tilting and La/ vacancy ordering were invoked to explain the 3.5O2a p Â O2a p Â 4a p unit-cell deduced.…”

Section: Resultsmentioning

confidence: 99%

Evidence for changes on the lithium conduction dimensionality of Li_0.5−yNa_yLa_0.5Nb₂O₆ (0 ≤ y ≤ 0.5) perovskites

et al. 2015

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“…In Ag 1−3x La x NbO 3 , for each La that substitutes for Ag, two A-site vacancies will be induced to maintain charge neutrality. Generally, at sufficiently high concertation, vacancies are prone to aggregate in order to minimize the free energy of the system [27,28]. The configuration of A-site vacancies in ANL4 is explored by analyzing the supercell reconstructed by the RMC method.…”

Section: A-site Vacancy Orderingmentioning

confidence: 99%

Local Atomic Configuration in Pristine and A-Site Doped Silver Niobate Perovskite Antiferroelectrics

Gao

Liu

et al. 2022

Research

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Antiferroelectrics have attracted increasing research interests in recent years due to both their great potential in energy storage applications and intriguing structural characteristics. However, the links between the electrical properties and structural characteristics of distorted perovskite antiferroelectrics are yet to be fully deciphered. Here, we adopt local-structure methods to elucidate the nanoscale atomic structure of AgNbO3-based antiferroelectrics and their structural evolution upon La doping. The local structural features including interatomic distance distributions and atomic displacements have been analyzed using neutron small-box pair distribution function (PDF) refinement in conjunction with large-box Reverse Monte Carlo modelling. Our results highlight the correlation of cation displacements in AgNbO3 and its disruption by the incorporation of La, apparently in corroboration with the observed anomalous dielectric properties. Spatial ordering of cation vacancies is observed in La-doped AgNbO3 samples, which coordinates with oxygen octahedral tilting to relieve lattice strain. These results provide renewed insights into the atomic structure and antiferroelectric phase instabilities of AgNbO3 and relevant perovskite materials, further lending versatile opportunities for enhancing their functionalities.

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Modulated Structure of La1/3−xLi3xNbO3 0≤x≤0.06 Perovskite-Related Materials

Cited by 39 publications

References 25 publications

Cation ordering in A-site-deficient Li-ion conducting perovskites La_(1−x)/3Li_xNbO₃

Cation ordering in A-site-deficient Li-ion conducting perovskites La_(1−x)/3Li_xNbO₃

Evidence for changes on the lithium conduction dimensionality of Li_0.5−yNa_yLa_0.5Nb₂O₆ (0 ≤ y ≤ 0.5) perovskites

Local Atomic Configuration in Pristine and A-Site Doped Silver Niobate Perovskite Antiferroelectrics

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Modulated Structure of La1/3−xLi3xNbO3 0≤x≤0.06 Perovskite-Related Materials

Cited by 39 publications

References 25 publications

Cation ordering in A-site-deficient Li-ion conducting perovskites La(1−x)/3LixNbO3

Cation ordering in A-site-deficient Li-ion conducting perovskites La(1−x)/3LixNbO3

Evidence for changes on the lithium conduction dimensionality of Li0.5−yNayLa0.5Nb2O6 (0 ≤ y ≤ 0.5) perovskites

Local Atomic Configuration in Pristine and A-Site Doped Silver Niobate Perovskite Antiferroelectrics

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Cation ordering in A-site-deficient Li-ion conducting perovskites La_(1−x)/3Li_xNbO₃

Cation ordering in A-site-deficient Li-ion conducting perovskites La_(1−x)/3Li_xNbO₃

Evidence for changes on the lithium conduction dimensionality of Li_0.5−yNa_yLa_0.5Nb₂O₆ (0 ≤ y ≤ 0.5) perovskites