Order-Disorder Transitions in Substitutional Solid Solutions

Reynaud, F.

doi:10.1002/pssa.2210720102

Cited by 24 publications

(10 citation statements)

References 184 publications

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“…To confirm that the domains are orientation variants, we must verify that each variant can transition into the other from one of the lost point group symmetry operators [10,14].The Fd 3 m R 3 m transition should produce four orientation variants as the material transitions from 48 symmetry operators to 12 symmetry operators [10,15] (Fig. 4c), which corresponds to configuration A 4 [7].The last 90°…”

Section: Domain Formationmentioning

confidence: 99%

Formation and effect of orientation domains in layered oxide cathodes of lithium-ion batteries

et al. 2016

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We show that in layered oxidesthat are employed as cathodes in lithium-ion batteries,the cation layers can order on different {111} NaCl planes within a single particle, which makes the lithium layer discontinuous across a particle.Thefindings challenge previous assertions that lithiumundergoes 2-D diffusion in layered oxides and the data provide new insights into the decrease in rate capabilities for some layered oxides. Therefore, it is critically important to understand how these discontinuities form and how the loss of 2-D diffusion impacts the overall performance of the layered oxide cathode materials. EmployingX-ray diffraction (XRD) and aberration-corrected scanning transmission electron microscopy (STEM), we find that as the material transitions from a disordered to an ordered state, it forms four orientation variants corresponding to the four {111} NaCl planes. This transition is not intrinsic to all layered oxides and appears to be more strongly affected by nickel. Furthermore, with energy dispersive spectroscopy(EDS), we show that there is an increase in the nickel concentrationat the interface between each orientation variant.This reduces the rate of lithium diffusion, negatively affects the rate capability, and could be contributing to the overall capacity fade.

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Section: Domain Formationmentioning

confidence: 99%

Formation and effect of orientation domains in layered oxide cathodes of lithium-ion batteries

et al. 2016

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“…As a result the ordering is realized in the "model of disordered order". The order-disorder transition temperature T K (the Kurnakov temperature [30]) seems to be around 1000 • C but the concrete value of the T K was not determined.…”

Section: Discussionmentioning

confidence: 92%

“…At the same time, disordered compounds and solid solutions are known to undergo order-disorder phase transition [27][28][29][30] and, certainly, such transitions should exist in the relaxors. This problem has been studied soon after the discovery of the relaxors [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47].…”

Section: Introductionmentioning

confidence: 99%

New Relaxors with the Perovskite Structure

Lemanov

2010

Ferroelectrics

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Perovskites PbBO 3 with multiple substitutions in the B-positions were synthesized. Ceramic samples with n = 2-6 (n is the number of different B-ions) were studied using X-ray diffraction, and measurements of dielectric permittivity at frequencies 12 Hz-100 kHz and temperatures 77-450 K. It has been shown that the samples are of the perovskite structure, they undergo phase transitions from disordered to ordered phase, and their dielectric behavior is typical for relaxors. The order-disorder phase transitions proceed with the unit cell doubling. Based on this and in accordance with random site model, the B-ion distribution over two sublattices is discussed.

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“…The High temperature phase with disordered Au and Ag atoms is called a B2 structure, and the ordered structure is the L2 1 structure (see Ref. [2]). From 15% to 35% atomic Au concentration, with the Zn concentration fixed to 50% [3], the B2 structure is stable until it melts.…”

Section: Introductionmentioning

confidence: 99%

Modelling the statics and the dynamics of fluctuations in the ordering alloy AuAgZn₂

Livet

Fèvre

Beutier

et al. 2022

Eur. Phys. J. Appl. Phys.

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The ordering alloy AuAgZn2 has a Heusser second-order transition at Tc ≃ 336.4°C. Static measurements of the critical scattering were carried out at the BM02 beamline of the European Synchrotron Radiation Facility (ESRF). These results are compared with Monte-Carlo simulations of the Ising model and show that the model with a simple interaction between two neighbouring atoms of the simple cubic Au/Ag lattice fully explains the X-ray diffuse scattering. Dynamic measurements obtained from X-ray scattering below Tc and the observation of X-ray photon correlations at the ESRF ID10 beamline are compared with dynamic simulations. It is shown that this system follows the predictions of “model A” [P.C. Hohenberg, B.I. Halperin, Rev. Mod. Phys. 49, 436 (1977)] for a transition with non-conserved order parameter. The dynamics of ordering with nearest neighbour exchange of atoms in the simple cubic lattice is shown to be equivalent to the usual Ising spin flip model, but with a different time scale. A comparison between the kinetics of ordering and the dynamics of the observed speckles arising from critical fluctuations shows some discrepancy suggesting the need for further experiments.

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Order-Disorder Transitions in Substitutional Solid Solutions

Cited by 24 publications

References 184 publications

Formation and effect of orientation domains in layered oxide cathodes of lithium-ion batteries

Formation and effect of orientation domains in layered oxide cathodes of lithium-ion batteries

New Relaxors with the Perovskite Structure

Modelling the statics and the dynamics of fluctuations in the ordering alloy AuAgZn₂

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Order-Disorder Transitions in Substitutional Solid Solutions

Cited by 24 publications

References 184 publications

Formation and effect of orientation domains in layered oxide cathodes of lithium-ion batteries

Formation and effect of orientation domains in layered oxide cathodes of lithium-ion batteries

New Relaxors with the Perovskite Structure

Modelling the statics and the dynamics of fluctuations in the ordering alloy AuAgZn2

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Product

Resources

About

Modelling the statics and the dynamics of fluctuations in the ordering alloy AuAgZn₂