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EnglishExtended x-ray absorption fine structure (EXAFS) measurements have been performed at the K edge of iodine in (AgI)(1-y)(Ag2MoO4)(y) glasses, with y = 0.25 and 0.33, as a function of temperature from 25 K to the glass transition temperature T-g similar or equal to 323 K. EXAFS monitors the short-range component of the I - Ag distance distribution. At 25 K, iodine coordinates to about four silver ions, at an average distance about 0.06 angstrom larger than in beta-AgI. As temperature increases, EXAFS monitors a progressive depletion of the short-range distribution, due to transitions of Ag ions into a long-range component. Coordination number and mean value of the short-range I - Ag distribution decrease while temperature is increasing. EXAFS results give information on the local modifications around iodine due to the ionic diffusivity.
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| Titolo: | Influence of temperature on the local structure around iodine in fast-ion-conducting Agl : Ag2MoO(4) glasses |
| Autori: | |
| Data di pubblicazione: | 2007 |
| Rivista: | |
| Abstract: | Extended x-ray absorption fine structure (EXAFS) measurements have been performed at the K edge of iodine in (AgI)(1-y)(Ag2MoO4)(y) glasses, with y = 0.25 and 0.33, as a function of temperature from 25 K to the glass transition temperature T-g similar or equal to 323 K. EXAFS monitors the short-range component of the I - Ag distance distribution. At 25 K, iodine coordinates to about four silver ions, at an average distance about 0.06 angstrom larger than in beta-AgI. As temperature increases, EXAFS monitors a progressive depletion of the short-range distribution, due to transitions of Ag ions into a long-range component. Coordination number and mean value of the short-range I - Ag distribution decrease while temperature is increasing. EXAFS results give information on the local modifications around iodine due to the ionic diffusivity. |
| Handle: | http://hdl.handle.net/11582/31662 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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