Low energy vibrational excitations characteristic of superionic glass

Nakamura, Mitsutaka; Iwase, Hiroki; Arai, M.; Kartini, Evvy; Russina, Margarita; Yokoo, Tetsuya; Taylor, J. W.

doi:10.1016/j.physb.2006.05.274

Cited by 7 publications

(5 citation statements)

References 8 publications

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“…It is obvious that superionic conducting glasses have larger low-energy intensity compared with an insulator glass AgPO 3 . These behaviors agree with our previous experiments 12) . In Fig.…”

Section: Methodssupporting

confidence: 94%

Novel Dynamics of Superionic Conducting Glasses Proved by Inelastic Neutron Scattering

et al. 2010

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The low-energy dynamics of Ag-based superionic conducting glass system has been investigated using the inelastic neutron scattering measurements. A clear correlation between the intensity in low-energy region and the dc ionic conductivity was found. The cross-linking factor is considered to be the network expansion by salt doping. Detailed investigations of low-energy dynamics both for varied superionic conducting glasses and insulator glass have proved that the peculiar Q dynamics beyond around 2 Å -1 is a characteristic feature only in superionic conducting glass.

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Section: Methodssupporting

confidence: 94%

Novel Dynamics of Superionic Conducting Glasses Proved by Inelastic Neutron Scattering

et al. 2010

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“…A Boson peak feature has been observed to be a universal and conspicuous feature of both crystalline and non-crystalline superionic materials. [96][97][98] Recent incoherent inelastic neutron scattering and accompanying simulations of high density amorphous ice have identified this type of localized low frequency oscillatory motions as taking the form of chains of molecules exhibiting collective oscillatory motion, 99 and we expect a similar phenomenon underlies these collective oscillations in our superionic material. (We illustrate the Boson peak for UO2, calculated in the conventional fashion, in Supplementary Information).…”

Section: B Basic Dynamical Properties Of Uomentioning

confidence: 77%

Superionic UO₂: A model anharmonic crystalline material

et al. 2019

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Crystalline materials at elevated temperatures and pressures can exhibit properties more reminiscent of simple liquids than ideal crystalline materials. Superionic crystalline materials having a liquid-like conductivity  are particularly interesting for battery, fuel cell, and other energy applications, and we study UO2 as a prototypical superionic material since this material is widely studied given its commercial importance as reactor fuel. Using molecular dynamics, we first investigate basic thermodynamic and structural properties. We then quantify structural relaxation, dynamic heterogeneity, and average ions mobility. We find that the non-Arrhenius diffusion and structural relaxation time of this prototypical superionic material can be quantitatively described in terms of a generalized activated transport model ('string model') in which the activation energy varies in direct proportion to the average string length. Our transport data can also be described equally well by an Adam-Gibbs model in which the excess entropy density of the crystalline material is estimated from specific heat and thermal expansion data, consistent with the average scale of string-like collective motion scaling inversely with the excess entropy of the crystal. Strong differences in the temperature dependence of the interfacial mobility from non-ionic materials are observed, and we suggest that this difference is due to the relatively high cohesive interaction of ionic materials. In summary, the study of superionic UO2 provides insight into the role of cooperative motion in enhancing ion mobility in ionic materials and offers design principles for the development of new superionic materials for use in diverse energy applications. † Corresponding authors: hao.zhang@ualberta.ca; jack.douglas@nist.gov *Official work of the US government-Not subject to copyright in the United States.

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“…On the other hand, the data with small E i provides more detailed information in the lower Q range. Detailed investigation on the Q dependence of low-energy excitation in the solid state ionic materials will promote better understanding of peculiar dynamical properties presented by the previous experiments at the ISIS [1][2][3][4]. It is well known that the structure factor of superionic conducting glass exhibits a strong and relatively sharp diffraction peak at anomalously low values of Q (0.6 < Q < 0.8 Å -1 ) [14,15].…”

Section: Resultsmentioning

confidence: 99%

“…We can easily extract a series of constant Q or E slices and also the integration over the arbitrary Q or E ranges from S(Q,E) map. In fact, our previous works on superionic conductors using INS measurement with pulsed neutron source have given new insight into the origin of ionic conductivity in the solid state [1][2][3][4]. As an example, the comparison of low-energy dynamics between superionic conducting glass (AgI) 0.5 (AgPO 3 ) 0.5 and insulator glass AgPO 3 was * Corresponding author.…”

Section: Introduction * * * *mentioning

confidence: 99%

A New Possibility of Dynamical Study on Solid State Ionic Materials by Inelastic Neutron Scattering

et al. 2011

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A new technique of inelastic neutron scattering measurement utilizing the multiple incident energies is applied to the dynamical study of vitreous silica. A wide variety of extracted information from a series of two-dimensional maps of dynamical structure factor with multiple different incident energies are greatly valuable. The applicability and its expected contribution of new experimental technique into the further progress of scientific activities in solid state ionic materials are discussed.

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Low energy vibrational excitations characteristic of superionic glass

Cited by 7 publications

References 8 publications

Novel Dynamics of Superionic Conducting Glasses Proved by Inelastic Neutron Scattering

Novel Dynamics of Superionic Conducting Glasses Proved by Inelastic Neutron Scattering

Superionic UO₂: A model anharmonic crystalline material

A New Possibility of Dynamical Study on Solid State Ionic Materials by Inelastic Neutron Scattering

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Low energy vibrational excitations characteristic of superionic glass

Cited by 7 publications

References 8 publications

Novel Dynamics of Superionic Conducting Glasses Proved by Inelastic Neutron Scattering

Novel Dynamics of Superionic Conducting Glasses Proved by Inelastic Neutron Scattering

Superionic UO2: A model anharmonic crystalline material

A New Possibility of Dynamical Study on Solid State Ionic Materials by Inelastic Neutron Scattering

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Product

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Superionic UO₂: A model anharmonic crystalline material