Crystal Research and Technology
Cryst. Res. Technol. 35 (2000) 369 - Abstract -

W. Yang-Bitterlich, U. Krämer

Institut für Kristallographie und Festkörperphysik, Technische Universität Dresden, Germany

TEM Investigation of Dislocations in RNi2B2C (R = Y, Tb, Ho, Er, Y0.6Tb0.4, Er0.8Tb0.2)

To evaluate the influence of different rare earth metals on dislocation type and stacking fault occurrence in RNi2B2C compounds samples with R = Y, Tb, Ho, Er, Y0.6Tb0.4 and Er0.8Tb0.2)were investigated. As a result of the TEM analysis the parameter decisive for the lattice defects in these compounds is not the type of components but the annealing treatment of the samples. In well homogenized material the dominant Burgers vector of perfect dislocations was <100] and stacking faults are hardly found. In inhomogeneous samples the dominant Burgers vector was <110] and the perfect dislocations often lie in the planes of the numerous stacking faults. In both types of materials the experimental results hint at the existence of two different slip systems.

Keywords: borocarbides, RNi2B2C, homogenization, TEM, lattice defects, superconductivity


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