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- W2009097279 abstract "A remarkable increase of the silver conductivity in glassy ${mathrm{AgPO}}_{3}$ by four orders of magnitude is known to occur on adding ${mathrm{PbI}}_{2}.$ We have investigated the structural changes that occur on ${mathrm{PbI}}_{2}$ doping in $({mathrm{PbI}}_{2}{)}_{0.1}{ensuremath{-}(mathrm{A}mathrm{g}mathrm{P}mathrm{O}}_{3}{)}_{0.9}$ and $({mathrm{PbI}}_{2}{)}_{0.1}{ensuremath{-}(mathrm{AgI})}_{0.1}{ensuremath{-}(mathrm{A}mathrm{g}mathrm{P}mathrm{O}}_{3}{)}_{0.8}$ using neutron- and x-ray-diffraction and Raman-scattering experiments. The microscopic structure of the glasses were modeled using the reverse Monte Carlo method, which produced structural models that are in quantitative agreement with both the x-ray and the neutron data, as well as with the experimental density and applied physical constraints on P-O coordination number and closest atom-atom approach distances. The aim was to examine the structural role of the immobile ${mathrm{Pb}}^{2+}$ and ${mathrm{I}}^{mathrm{ensuremath{-}}}$ ions for the ionic conductivity. The results show that the ${mathrm{Pb}}^{2+}$ and ${mathrm{I}}^{mathrm{ensuremath{-}}}$ ions expand the ${mathrm{PO}}_{4}$ network, which opens doorways and creates new pathways in the structure suitable for ion conduction. Furthermore, almost all the ${mathrm{Pb}}^{2+}$ ions coordinate mainly to oxygens and in that way contribute to a partial dissociation of the ${mathrm{Ag}}^{+}$ ions from the nonbridging oxygens. The iodine ions play a similar role by expanding the host glass and coordinating to silver ions, leading to a further decrease of the Ag-O coordination. The ${mathrm{PbI}}_{2}$-induced expansion of the glass network and reduction of the average Ag-O coordination number are likely to decrease both the elastic strain energy ${E}_{g}$ and the electrostatic binding energy ${E}_{b}$ and thereby the total activation energy for ${mathrm{Ag}}^{+}$ migration." @default.
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- W2009097279 date "1999-11-01" @default.
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- W2009097279 title "Conductivity enhancement in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>PbI</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mo>−</mml:mo><mml:mi mathvariant=normal>A</mml:mi><mml:mi mathvariant=normal>g</mml:mi><mml:mi mathvariant=normal>I</mml:mi><mml:mo>−</mml:mo><mml:mi mathvariant=normal>A</mml:mi><mml:mi mathvariant=normal>g</…" @default.
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- W2009097279 doi "https://doi.org/10.1103/physrevb.60.12023" @default.
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