Ueber die Grenzen des festen Zustandes III

Tammann, G.

doi:10.1002/andp.18993040802

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…3 yields almost identical results. Although the temperature evolution of the relaxation time of most relaxor ferroelectrics can be described by the Vogel-Fulcher-Tammann law [58][59][60], some relaxors, e.g. PLZT8/65/35 and SBN75 [61], follow Arrhenius behavior.…”

Section: B Dielectric Measurementsmentioning

confidence: 99%

Intriguing relaxor ferroelectricity in a polar CT crystal at the neutral-ionic interface

Fischer,

D'Avino,

Masino

et al. 2020

Preprint

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We investigated the mixed-stack charge-transfer crystal, N,N-dimethylphenazine-TCNQ (M2P-TCNQ), which is polar at room temperature and just at the neutral-to-ionic interface (ionicity ρ ≈ 0.5). We detect the typical dielectric signature of a relaxor ferroelectric and an asymmetric positive-up-negative-down behavior. While relaxor ferroelectricity is usually ascribed to disorder in the crystal, we find no evidence for structural disorder in the investigated crystals. To elucidate the origin of M2P-TCNQ's dielectric properties we perform parallel structural and spectroscopic measurements, associated with theoretical modeling and quantum-mechanical calculations. Our combined effort points to a highly polarizable electronic system that is strongly coupled to lattice vibrations. The found indications for polarization reversal imply flipping of the bent conformation of the M2P molecule with an associated energy barrier of a few tens of an eV, broadly consistent with an Arrhenius fit of the dielectric relaxation times. While the polarization is mostly of electronic origin, its possible reversal implies slow collective motions that are affected by solid-state intermolecular interactions.

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Section: B Dielectric Measurementsmentioning

confidence: 99%

Intriguing relaxor ferroelectricity in a polar CT crystal at the neutral-ionic interface

Fischer,

D'Avino,

Masino

et al. 2020

Preprint

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“…Tammann (33) has investigated the conductance of solutions of strong electrolytes in water under pressure. Some of his results for sodium chloride are reproduced in Fig.…”

Section: Electrolytementioning

confidence: 99%

On the Relation Between the Conductance and the Viscosity of Electrolytic Solutions and Its Bearing on the Theory of These Solutions.

Kraus¹

1914

J. Am. Chem. Soc.

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That the conductance of an electrolytic solution is dependent on its viscosity was first suggested by G. Wiedemann(~)~ in 1856. The ex-"The Organic Acid Amides and their Metallic Derivatives as Acids and Salts of the Ammonia System of Acids, Bases and Salts," Trans. 8th Intern. Congr. Apfil. Chem., 6, 119 (1912). 2 This investigation was assisted by a grant made to Prof. A. A. Noyes by the Carnegie Institution of Washington. I wish to express my indebtedness for this assistance whereby the completion of this work was made possible. References to earlier papers will be found in the collected list of references a t the e n d of this paper. * This condition is partially ful6lled in the case of solutions of KI in water. Danneel(48). Kraus and Bray(qg), pp. 1368-9.

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Silber und Jod

Keim¹

1972

Silber

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Ueber die Grenzen des festen Zustandes III

Cited by 5 publications

References 7 publications

Intriguing relaxor ferroelectricity in a polar CT crystal at the neutral-ionic interface

Intriguing relaxor ferroelectricity in a polar CT crystal at the neutral-ionic interface

On the Relation Between the Conductance and the Viscosity of Electrolytic Solutions and Its Bearing on the Theory of These Solutions.

Silber und Jod

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