Diamantkoerper

The diamond body (12) contains at least one longitudinal recess (13,15), extending at an angle to mechanical stresses induced by coupling to each heat source (30). Pref. a number of recesses extend obliquely to a heat flow direction induced by at least one heat source and/or heat sink. The number of the recesses may be so aligned w.r.t. each heat source and/or heat sink that the alignment angles to the mechanical stresses are larger than those to the heat flow directions. Typically the recesses are aligned orthogonally to the mechanical stresses. ADVANTAGE - Reduced danger of connection loosening or diamond body destruction by thermally induced mechanical stresses.