INFLUENCE OF H-D ISOTOPIC-SUBSTITUTION ON THE PROTONIC CONDUCTIVITY OF LINBO3

Autor(en): KLAUER, S
WOHLECKE, M
KAPPHAN, S
Stichwörter: CRYSTALS; DEFECTS; DEUTERIUM; DIFFUSION; HYDROGEN; Materials Science; Materials Science, Multidisciplinary; OH-IONS; Physics; Physics, Applied; Physics, Condensed Matter; PROFILES; REFRACTIVE-INDEX; TIO2; WAVE-GUIDES
Erscheinungsdatum: 1992
Herausgeber: AMERICAN PHYSICAL SOC
Journal: PHYSICAL REVIEW B
Volumen: 45
Ausgabe: 6
Startseite: 2786
Seitenende: 2799
Zusammenfassung: 
The electric dc dark conductivity in congruent LiNbO3 has been studied in the temperature range 80-600-degrees-C as a function of the proton and deuteron concentration and the driving electric field. The conductivity was found to follow an Arrhenius-like behavior with an activation energy equal for protons and deuterons, epsilon-act = 1.23 eV. The pre-exponential factor sigma-0 shows a linear concentration dependence for both H and D, but with different slopes. The ratio of the slopes yields (partial-derivative-sigma-0/partial-derivative-c)H/(partial-derivative-s igma-0/partial-derivative-c)D = 1.36. This agrees with the mass dependence of the attempt frequencies in a hopping model of protons and deuterons and rules out models of OH-OD migration. The conductivity was found to be independent of the electric field up to values of 10(5) V/cm, which is comparable to inner electric fields in volume holograms in LiNbO3. In the temperature range accessible to both methods, the dc and the holographically measured values of the conductivity agree very well, displaying the same temperature and concentration dependence. The charge-carrier concentration was determined from the integrated absorption strength of the ir OH-OD stretch-mode absorption of proton- and deuteron-exchanged waveguides with a known rate of exchange of Li by H-D, yielding an oscillator strength f(H) = 1.7 x 10(-2).
ISSN: 01631829
DOI: 10.1103/PhysRevB.45.2786

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