�berschu�- und Defektprotonenleitung durch H2O-Bildung im Mg(OH)2-Gitter

Gieseke, Werner; Nägerd, Hans; Freund, Friedemann

doi:10.1007/bf00593077

Naturwissenschaften

1970

DOI: 10.1007/bf00593077

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�berschu�- und Defektprotonenleitung durch H2O-Bildung im Mg(OH)2-Gitter

Werner Gieseke

Hans Nägerd

Friedemann Freund³

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Cited by 9 publications

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“…dridge and Ferry,6 the AH values for the formation of 1 mol of cross links out of 2 mol of cross linking sites are then obtained from log c = (AH/2.303R)1/T + constant(1) …”

mentioning

confidence: 99%

Effect of pressure on the thermodynamically reversible gelation of 12-hydroxystearic acid in carbon tetrachloride

Taniguchi¹,

Suzuki²

1974

J. Phys. Chem.

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“…dridge and Ferry,6 the AH values for the formation of 1 mol of cross links out of 2 mol of cross linking sites are then obtained from log c = (AH/2.303R)1/T + constant(1) …”

mentioning

confidence: 99%

Effect of pressure on the thermodynamically reversible gelation of 12-hydroxystearic acid in carbon tetrachloride

Taniguchi¹,

Suzuki²

1974

J. Phys. Chem.

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Proton Conductivity of Simple Ionic Hydroxides Part I: The Proton Conductivities of Al(OH)₃, Ca(OH)₂, and Mg(OH)₂

Freund¹,

Wengeler²

1980

Ber Bunsenges Phys Chem

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Elektrische Eigenschaften / Katalyse / Protonenleitung / ThermodiffusionProton conductivity is an outstanding feature of AI(OH),, Mg(OH),, and Ca(OH), powders between room temperature and their respective dehydration temperatures. It can be measured by using Pd-black electrodes in H, either by d. c. conductivity measurements, applying high injection voltages (> lo4 V/cm), or by thermopotential measurements. Two conductivity mechanisms are observed which can be assigned to proton conductivity uh and defect proton conductivity u,!,. The activation energies uh are 1.65, 2.0, and 2.2 eV for AI(OH),, Mg(OH),, and Ca(OH), respectively. The activation energies ug are lower, ranging between 0.5 -1.0 eV. 4 occurs 20-60 K below the on-set temperature of dehydration. It is enhanced by the adsorption of CH,COOH vapor and suppressed by NH, vapor acting as proton donator and proton acceptor or traps respectively. Protonenleitung uH tritt bei Al(OH),, Mg(OH), und Ca(OH), zwischen Raumtemperatur und der Entwasserungstemperatur auf. uH ist meRbar mittels Palladiummoor-Elektroden in H, als Gleichstrom-Leitfahigkeit, wenn hohe Injektionsspannungen, > lo4 V/cm, angelegt werden, oder als Thermospannung im Temperaturgradienten. Mit Cu-Elektroden tritt keine uH auf. Zwei Leitfahigkeitsmechanismen sind erkennbar: Exzefiprotonen-Leitfahigkeit u i (p-Leitung) und Defektprotonen-Leitfiihigkeit a,!, (n-Leitung). Die Aktivierungsenergien fiir u;l betragen 1,65, 2,O und 2,2 eV bei AI(OH)?, Mg(OH), und Ca(OH),, die fur u,!, liegen niedriger, 0,5 -1 ,O eV. ExzeRprotonen-Leitung tritt 20 -60 K vor dem Beginn der Entwasserung auf. Durch Adsorption von CH3COOH-Dampf wird 0; urn den Faktor 1 3 -3 erhdht, durch Adsorption von NH3 unterdriickt.

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The potential energy curve of the proton and the dissociation energy of the OH− ion in Mg(OH)2

Martens

Freund

1976

Phys. Stat. Sol. (a)

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The overtone and combination bands, Eon, of the infrared‐active (vu) and Raman active (vg) OH stretching vibrations of Mg(OH)2 are measured (values for Mg(OD)2 in brackets). Fundamentals E01 vu at 3697 (2720) cm−1 and vg at 3655 cm−1; first overtone E02: vu + vg at 7154 (5305) cm−1; second overtone E03; 3vu at 10480 (7830) cm−1; third overtone E04: 3vu + vg at 13640 (10250) cm−1; fourth overtone E05: 5vu or 3vu + 2vg at 16610 cm−1; fifth overtone E06 at 19320 cm−1. The isotope shift factor (theoretical 1.37) decreases from 1.36 for the fundamentals E01 to 1.33 for E04. The potential barrier between proton sites in adjacent OH− groups is of the order of 2.6 eV (60 kcal mol−1). The dissociation energy of the OH− groups in the Mg(OH)2 lattice, 4.70 eV (108.3 kcal mol−1), agrees well with the thermodynamic value, 4.71 eV (108.6 keal mol−1), derived for the free OH− ion.

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�berschu�- und Defektprotonenleitung durch H2O-Bildung im Mg(OH)2-Gitter

Cited by 9 publications

References 1 publication

Effect of pressure on the thermodynamically reversible gelation of 12-hydroxystearic acid in carbon tetrachloride

Effect of pressure on the thermodynamically reversible gelation of 12-hydroxystearic acid in carbon tetrachloride

Proton Conductivity of Simple Ionic Hydroxides Part I: The Proton Conductivities of Al(OH)₃, Ca(OH)₂, and Mg(OH)₂

The potential energy curve of the proton and the dissociation energy of the OH− ion in Mg(OH)2

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�berschu�- und Defektprotonenleitung durch H2O-Bildung im Mg(OH)2-Gitter

Cited by 9 publications

References 1 publication

Effect of pressure on the thermodynamically reversible gelation of 12-hydroxystearic acid in carbon tetrachloride

Effect of pressure on the thermodynamically reversible gelation of 12-hydroxystearic acid in carbon tetrachloride

Proton Conductivity of Simple Ionic Hydroxides Part I: The Proton Conductivities of Al(OH)3, Ca(OH)2, and Mg(OH)2

The potential energy curve of the proton and the dissociation energy of the OH− ion in Mg(OH)2

Contact Info

Product

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Proton Conductivity of Simple Ionic Hydroxides Part I: The Proton Conductivities of Al(OH)₃, Ca(OH)₂, and Mg(OH)₂