The thermoelastic effect decreases with increasing concentration 01 linear defects ('uedge dislocations') generated by plastic deformation. Hence. an improvement of binding may be assumed. We interpret the linear defects as resulting from interstitial atoms, six per lattice constant c. Binding is increased by additional D and n bonds, with components perpendicular and parallel to the trigonal chains. It is shown experimentally that the linear interstitial defects (LID) are active as acceptors. causing quasi-metallic p-type conduction. This may be realized from the assumption that, in the cylindrical LID potential, a twodimensional interaction yieldsequivalent eigenstatesand aquasi-tree motion parallel to the linear defects. The model. in addition, allows the interpretation ofdcfect-induced cyclotron resonance inactive-mode absorption in an unconstrained manner. asa rnuliof ihc acccptor effect of the quasi-one-dimensional defects. Furthermore. the angulardependcnand h e structure of resonant scattering in the magnrto-impurityefiects under hot c;lrriermnJitionr oi built-in group V atomscan be explained quantitatively