Highlights of the 1987 E-MRS Meeting
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Session Lectures The Plenary Sessions will feature four invited lectures by Minko Balkanski, Jacques Derrien, Gottfried Landwehr, and Michael G. Somekh. The following extended abstracts summarize the Plenary lectures.
between glass structure and its physical properties is still to be established. Fast ion conducting glasses are used as solid electrolyte in solid-state integrable batteries (S2IB). The optimization of this application depends essentially on two parameters: the glass should be an excellent electronic insulator and should, on the ^ÜiÜsi^ other hand, have good ionic conductivity. These two conditions should hold in the limits of very thin films. Fast ion conduction is related to the glass structure. The effects of the glass matrix structure on the dynamical behavior in fast ion conduction is best seen when it is possible to modify the structure by an external parameter. Laser and temperature annealing create the conditions of structural changes. Laser annealing can be handled with sufficient precision in order to induce the glass-crystalline transition.1 Depending on the incident laser energy density, three ? 3 flUi? significant effects are observed by light scattering: (1) spectral band narrowing indicating Cluster enlargement constitutes a ' B=MKOöass«M^®(aM^^dfa precursor effect, (2) an intensity increase effect indicating a rapid rise of the density of Clusters attending microcrystallite size, and m oSag spnpsiia sdhÄMdl (fear fe fl K P (3) a dynamical reversal effect indicating glass •'MSm Mmtäm- ÖBtöl JoBsag M AB crystalline instability. Cluster volume and iGrasfoptf®.towtedloafllk ®flüfe®( p m crystallization appear as separate but re% iE lMbn((AToth ordered and disordered surfaces. havior of the surfaces and interfaces while Moreover, it is a relatively simple, laboraphotoemission spectroscopy reflects the tory-based apparatus and therefore more densities of occupied states of energy accessible than surface EXAFS studies by lower than that of the Fermi level (E5EF). Synchrotron radiation. In the first part of this lecture, the physiOne can easily see that at least two kinds of techniques are lacking: (1) For a surface cal principles of the SEELFS technique, its or interface without a long-range order, capabilities and limits will be discussed. where the diffraction techniques are un- Several examples will be given, with particsuccessful, short-range order techniques ular attention to the local order of clean need to be developed. (2) The band struc- surface, adsorbate monolayer on clean surture of a solid cannot be fully understood face, initial stages of metal-semiconductor without information on the empty states interface formation, and metallic Cluster extending above the Fermi level (E5EF). growth on solid Substrate. Recently, we have developed two new In the second part of this lecture, we and simple techniques probing the local show evidence of extended fine structures geometry of the sample, and a technique of observed above core-valence-valence empty states. All these techniques are used
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