The elastic parameters of dislocations in rutile crystals in the temperature range from 100 t o 298 K are determined b y numerical calculations in terms of an anisotropic elasticity theory. The results are applied t o possible dislocation reactions and elastic stress fields of dislocations. The energy factor of edge dislocations in planes of important zone axes and the dependence of the energy factor on the edge-screw composition angle 19 for verious dislocations are analysed. Moreover, the relation between the dislocation parameters and the choice of slip system is considered based on the criterion of minimum dislocation energy. According to the analysis of dislocation reactions, i t appears that the (101) {OIO}, (111) {101}, and(100) { 101) type dislocations are energetically unstable and there is a chance of their dissociating into other perfect or partial dislocations. It is believed that the (101) {101} type dislocation is possible to dissociate into 1/2(101) { 101) type collinear partial dislocations.Les parambtres elastiques de differentes dislocations dans des monocristaux de rutile ont 6t6 calculks numeriquement en fonction de la temperature entre 100 e t 298 K en utilisant la thkorie de I'dasticite anisotrope. Les rksultats obtenus sont utilises pour etudier les reactions de dislocations possibles e t Ie champ de contraintes Blastiques autour de certaines dislocations. On analyse bgalement les valeurs d u coefficient d'energie K pour des dislocations coins appartenant B des plans correspondant des axes de zone importants e t la variation de ce coefficient e n fonction de l'angle dorientation de la ligne pour diffkrentes dislocations. On discute enfin la relation entre les valeurs des parametres klastiques des dislocations e t le choix du systeme de glissement par rapport au critPre d'hergie de dislocation minimale. Lanalyse des reactions de dislocations montre que les dislocations (101) {OlO}, (111) {101} e t (100) {lOl} sont BnergCtiquement instables e t doivent done se dissocier en dautres dislocations parfaites ou partielles. I1 apparait d'autre part que la dissociation d'une dislocation (101) { 101) en deux partielles colineaires +(101) { 101 } est toujours Pnergetiquement favorable. 23'
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