Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

Wakamura, Kunio

doi:10.1016/j.ssi.2009.08.009

Cited by 21 publications

(23 citation statements)

References 72 publications

(171 reference statements)

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“…Therefore the fourth order anharmonicity is produced from those modes. Since these conditions are satisfied for IHCs, 2) 18) In this mechanism, the roles of phonon modes are much important under the coupling with OH-mode. We indicate a close relation of phonon mode of host lattice to H + -ion conduction from several relationships.…”

Section: Role Of Coupling Of Oh-mode With Host Lattice Mode On H + -Imentioning

confidence: 99%

“…2,18) SICs and super-proton conductors (SPCs) are plotted on the A-curve represented with a chain line as…”

Section: Correlation Of To E Ac Values In Impurity-type Proton Conducmentioning

confidence: 99%

“…Then the enhancement of vibration displacement u is realized as derived from the equation of motion. 2) At resonance state, Wakamura assumes the E ac value proportional to (1/u 2 ) value, and derives the E ac value relating to the 0 value from Eq. (4) as ).…”

Section: Origin Of the Relationship Between Eac And Values For Ihcsmentioning

confidence: 99%

“…2,10,18) The second is the relationships between E ac and LEO values, 20,21) and also between volume and E ac values suggested from Eq. (5).…”

Section: Role Of Coupling Of Oh-mode With Host Lattice Mode On H + -Imentioning

confidence: 99%

“…If it is established, the role of electronic structure on the conduction of impurity H + -ion must be elucidated with reference to that of SICs. 2) In this paper, we estimate values and phonon frequencies of BaCe -x M x O 3 (x=0, 0.1, 0.15 for M=Nd and x=0.05, 0.10 for M=Gd ) from measured infrared reflectivity spectra at room temperature, and examine the relationship between and E ac values. To interpret obtained proportional form, we consider a simple oscillator with respect to the influence of polarization field of host lattice on H + -ion.…”

Section: Introductionmentioning

confidence: 99%

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Relationship Between Optical Dielectric Constant and Ionic Activation Energy in Perovskite-Type Proton Conductors BaCe_1-xM_xO₃(M = Nd and Gd )

Wakamura

Uemori

2010

J. Phys. Soc. Jpn.

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To investigate the correlation between the activation energy E ac and electronic structure near the band gap for impurity-type H + -ion conductors, we measured infrared reflectivity spectra of sintered BaCe 1-x M x O 3 (x=0, 0.10, 0.15 for M=Nd and x=0.05, 0.1 for M= Gd) at room temperature, and estimated optical dielectric constant and the phonon frequencies of LO-and TO-modes with Kramers-Kronig analysis. We found a clear proportionality represented as E ac -0.14=[1/( -1.4)]. The proportional form is shifted from that of superionic conductor. For the origin of the shift, we attribute weakened influence of the Coulomb force of the host lattice on mobile H + -ion. This mechanism is confirmed from the volume and mass dependences of E ac values, and also from reasonable interpretation about smaller E ac value of AB 1-x M x O 3 than that of ABO 3 with respect to the impurity electronic levels near the band edge.

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Section: Role Of Coupling Of Oh-mode With Host Lattice Mode On H + -Imentioning

confidence: 99%

“…2,18) SICs and super-proton conductors (SPCs) are plotted on the A-curve represented with a chain line as…”

Section: Correlation Of To E Ac Values In Impurity-type Proton Conducmentioning

confidence: 99%

Section: Origin Of the Relationship Between Eac And Values For Ihcsmentioning

confidence: 99%

“…2,10,18) The second is the relationships between E ac and LEO values, 20,21) and also between volume and E ac values suggested from Eq. (5).…”

Section: Role Of Coupling Of Oh-mode With Host Lattice Mode On H + -Imentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Relationship Between Optical Dielectric Constant and Ionic Activation Energy in Perovskite-Type Proton Conductors BaCe_1-xM_xO₃(M = Nd and Gd )

Wakamura

Uemori

2010

J. Phys. Soc. Jpn.

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Diffusion in Solid Proton Conductors: Theoretical Aspects and Nuclear Magnetic Resonance Analysis

Vona

Sgreccia

Tosto

2012

Solid State Proton Conductors

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Water behavior in solid proton conductors is a considerably complex phenomenon. However, the knowledge of transport and diffusivity inside electrolytes is an important requirement for many applications. Extensive efforts have been made in terms of modeling water transport and its management. Accurate measurements of diffusion are required to validate these models and to optimize the performance of solid proton conductors.The focus of this chapter is the theoretical approach together with the use of nuclear magnetic resonance (NMR) techniques for the understanding of diffusion phenomena in solid proton conductors. The basic principles and the main NMR methods will be also discussed.

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Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule

Ling

et al. 2021

Advanced Energy Materials

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Perovskite‐type metal oxides such as Y‐doped BaMO3 (M = Zr/Ce) have drawn considerable attention as proton‐conducting electrolytes for intermediate temperature ceramic electrochemical cells. Improving the proton conductivity at lower temperatures requires a comprehensive understanding of the proton conduction mechanism. By applying high pressure or varying the Ce content of Y‐doped BaMO3, it is demonstrated that the proton conductivity follows the Meyer–Neldel rule (MNR) well. In the Arrhenius plot, the conductivities intersect at an isokinetic temperature, where the proton conductivity is independent of activation energy. Considering the relationship between isokinetic temperature and lattice vibration frequency, a high isokinetic temperature is observed in materials with stiff lattices, consisting of light atoms and small MO bond length. Based on consideration of the MNR, it is suggested that the enhancement of proton conductivity at low temperature can be well achieved by tuning lattice vibration frequency toward a desired isokinetic temperature.

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Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

Cited by 21 publications

References 72 publications

Relationship Between Optical Dielectric Constant and Ionic Activation Energy in Perovskite-Type Proton Conductors BaCe_1-xM_xO₃(M = Nd and Gd )

Relationship Between Optical Dielectric Constant and Ionic Activation Energy in Perovskite-Type Proton Conductors BaCe_1-xM_xO₃(M = Nd and Gd )

Diffusion in Solid Proton Conductors: Theoretical Aspects and Nuclear Magnetic Resonance Analysis

Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule

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Ion conduction in proton- and related defect (super) ionic conductors: Mechanical, electronic and structure parameters

Cited by 21 publications

References 72 publications

Relationship Between Optical Dielectric Constant and Ionic Activation Energy in Perovskite-Type Proton Conductors BaCe1-xMxO3(M = Nd and Gd )

Relationship Between Optical Dielectric Constant and Ionic Activation Energy in Perovskite-Type Proton Conductors BaCe1-xMxO3(M = Nd and Gd )

Diffusion in Solid Proton Conductors: Theoretical Aspects and Nuclear Magnetic Resonance Analysis

Optimizing the Proton Conductivity with the Isokinetic Temperature in Perovskite‐Type Proton Conductors According to Meyer–Neldel Rule

Contact Info

Product

Resources

About

Relationship Between Optical Dielectric Constant and Ionic Activation Energy in Perovskite-Type Proton Conductors BaCe_1-xM_xO₃(M = Nd and Gd )

Relationship Between Optical Dielectric Constant and Ionic Activation Energy in Perovskite-Type Proton Conductors BaCe_1-xM_xO₃(M = Nd and Gd )