Herstellung des neutralen homozyklischen Silylens 2 erfolgt durch Aminabspaltung mit Kaliumgraphit (KC8) von dem bizyklischen Silicium(I)-Amid J und anschließende Reaktion SiMe3Cl. Diese verläuft über die anionische homoaromatische Siliciumringverbindung 1. Das zweifachkoordinierte Siliciumatom im Silylen wird eine allylartige π-Elektronendelokalisation stabilisiert. reagiert in einer oxidative...

Precursors of lanthanum oxide and of (3La2O3, 5Ga2O3, SiO2) system were first elaborated then thermally decomposed into polycrystalline lanthanum oxide and langasite La3Ga5SiO14. The as prepared lanthanum oxide powder was then hydrated and carbonated to give hydroxicarbonates: thermal decomposition of these complex system La2O3-X(OH)y(CO3)z was studied by Fourier Transform infrared spectroscopy...

We consider processes in which a focused laser beam is used to induce the melting of silicium. The first goal of this paper is to propose a simple three-dimensional (3D) model of this melting process. Our model is partly based on an energy balance equation. This model leads to a nontrivial ODE describing the evolution in time of the dimension of the melt region. The second goal of this paper is...

bond o f i m p u r i t i e s a t t h e s u r f a c e o f p o l y c r y s t a l l i n e s i 1 i c o n samples g rown on a c a r b o n r i b b o n . B e s i d e s m a i n i m p u r i t i e s ( c a r b o n and o x y g e n ) , a l w a y s p r e s e n t a t c o n c e n t r a t i o n s a r o u n d t h e i r l i m i t o f s o l u b i l i t y i n s i l i c o n , m e t a l i m p u r i t i e s have been ...

The goal of this thesis was to better understand and control nanowire growth by the Vapour Liquid Solid method, bymeans of structural, chemical and electronic characterization of nanowires using transmission electron microscopy.A first subject of study was the behavior of the gold catalyst particle. We have shown that control can be obtainedover gold diffusion from the catalyst part...

Les parametres phenomelogiques dans la photopile (n+/p/p+) au silicium a jonctions verticales series, sous eclairement, sont utilises pour extraire resistance serie, chaque dose dirradiation appliquee. Lequation de diffusion des porteurs minoritaires charge electriques base (p) est influencee par le flux et lintensite lirradiation particules chargees. Sa resolution conduit densite courant charg...