転位と不純物との相互作用に関する研究(6) : KCl:Sr2+単結晶中の転位と不純物との力対距離関係に及ぼす不純物の状態の影響

Study on the interaction between a dislocation and impurities Part VI Influence of the state of impurities on force-distance curve between a dislocation and the impurity in KCl:Sr2+ single crystals

Creators Kohzuki Yohichi

Strain-rate cycling tests associated with the oscillation were carried out at 80 to 240K for two kinds of single crystals: quenched and annealed specimens of KCl:Sr2+ (0.050 mol% in the melt). The following three results were mainly found on the basis of linear plots of effective stress vs. temperature and proportionality of temperature vs. activation energy. 1: The force-distance profile, which expresses the interaction between a dislocation and an impurity, cannot be approximated by the Fleischer’s model when I-V (Impurity-Vacancy) dipoles turn into aggregates (at least trimers). 2: Comparing with the quenched specimen, the activation energy for the break away of a dislocation from the impurity becomes small for the annealed one. 3: The critical temperature, ＴＣ, for the annealed specimen is slightly smaller in contrast to that for the quenched one.

[ISSN]0387-9232

[NCID]AN00031668