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• W1973713887 endingPage "2799" @default.
• W1973713887 startingPage "2786" @default.
• W1973713887 abstract "The electric dc dark conductivity in congruent ${mathrm{LiNbO}}_{3}$ has been studied in the temperature range 80--600 ifmmode^circelsetextdegreefi{}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, ${mathrm{ensuremath{varepsilon}}}_{mathrm{act}}$=1.23 eV. The pre-exponential factor ${mathrm{ensuremath{sigma}}}_{0}$ shows a linear concentration dependence for both H and D, but with different slopes. The ratio of the slopes yields (ensuremath{partial}${mathrm{ensuremath{sigma}}}_{0}$/ensuremath{partial}c${)}_{mathrm{H}}$/(ensuremath{partial}${mathrm{ensuremath{sigma}}}_{0}$/ensuremath{partial}c${)}_{mathrm{D}}$=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 ${mathrm{LiNbO}}_{3}$. 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 ${mathit{f}}_{mathrm{H}}$=1.7ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}2}$." @default.
• W1973713887 created "2016-06-24" @default.
• W1973713887 creator A5045215898 @default.
• W1973713887 creator A5049873941 @default.
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• W1973713887 date "1992-02-01" @default.
• W1973713887 modified "2023-10-02" @default.
• W1973713887 title "Influence of H-D isotopic substitution on the protonic conductivity of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>LiNbO</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>" @default.
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• W1973713887 doi "https://doi.org/10.1103/physrevb.45.2786" @default.
• W1973713887 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10001827" @default.
• W1973713887 hasPublicationYear "1992" @default.
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