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Titre : Comptes rendus de l'Académie des sciences. Série 2, Mécanique, physique, chimie, sciences de l'univers, sciences de la terre
Auteur : Académie des sciences (France). Auteur du texte
Éditeur : Centrale des revues (Montrouge)
Date d'édition : 1989-01-13
Notice du catalogue : http://catalogue.bnf.fr/ark:/12148/cb343942015
Notice du catalogue : https://gallica.bnf.fr/ark:/12148/cb343942015/date
Type : texte
Type : publication en série imprimée
Langue : français
Format : Nombre total de vues : 58253
Description : 13 janvier 1989
Description : 1989/01/13 (SER2,T308,N2).
Droits : Consultable en ligne
Droits : Public domain
Identifiant : ark:/12148/bpt6k5662720w
Source : Bibliothèque nationale de France, département Collections numérisées, 2009-3813
Conservation numérique : Bibliothèque nationale de France
Date de mise en ligne : 01/12/2010
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CONTENTS
1989 — VOLUME 308 — SECTION II — N° 2
Condensed Matter Physics
Behaviour of oxygen atoms in the change with temperature of the unit cell of the YBa2Cu3Oe 84 compound, Jovan KoNSTANTINOVIC, Georges PARETTE, Alain MENELLE and Zoran B. DJORDJEVIC. 143
Neutron diffraction measurements have been performed at different temperatures on the YBa2Cu30684 compound. The variation along the c axis of the coordinates of oxygen atoms surrounding the Cu (2) copper atom, versus temperature in the vicinity of Tc, suggest that the position of there oxygen atoms play an important role in the superconductivity of Y-Ba-Cu-0 compounds.
Surface and Interphase Physics
Remaining film left by a falling drop inside a capillary tube, David QUÉRÉ and Jean-Marc DI MEGLIO 147
A simple dérivation of the thickness e of the film left by the drainage by gravity of a capillary tube (or equivalently, left by a falling drop) is presented. When the capillary radius b is much smaller thon the capillary length K- 1, the thickness is given by e = (1.3/4)(b7/3/K-4/ 3) and is thus independent of the viscosity of the liquid. On the experimental side, this thickness has been determined by ESR for spin-labelled silicone oil drops falling in vertical glass tubes and is fully consistent with our theory.
Crystallography
Fundamental concepts of crystallography, Louis MICHEL and Jan MOZRZYMAS. 151
We introduce a new set of definitions of the fundamental concepts of n-dimensional crystallography. It is based on general properties of group actions. We also show how to determine the crystallographic System and the Bravais class of a crystallographic group.
Solid State Physics
Cr3+ Spin-lattice relaxation in the Cu2xCr2xSn2-2xS4 spinel solid solution, Isabelle S ARDA, Pierre COLOMBET,
Guy ABLART and Jacques PESCIA 159
In order to determine the origin of the broadening of the Cr 3 + high-température E.P.R. Une for the spinel compounds Cu2xCr2xSn2_2xS4, especially in the semiconductor range (xrgO.5), the spin-lattice relaxation rate has been studied using a modulation spectrometer. The relaxation time is found to be very short (~ 10 -9 sec.) although the Cr 3 + orbital moment is quenched. This behavior is accounted for by considering Bloembergen and Wang's three-reservoir model.
Solid State Chemistry
(see Tome 308, Series II, 1989, p. 159)