[en] Full text: A reappraisal of BCS theory for light-element superconductors suggests high temperature superconductivity could be achieved in allotropes of boron and carbon compounds. We have grown boron doped diamond epitaxial films on < 111 > oriented diamond substrates by Chemical Vapour Deposition (CVD) with critical temperatures as high as 8 K. Recent reports in the literature present data for a “quenched” high temperature phase of C:B with much higher critical temperatures above 50 K. We have found that our CVD films have a high upper critical magnetic field which makes the material attractive for superconducting device fabrication. Recently we have developed a process in which the superconducting material can be transformed to a normal phase by means of ion irradiation. In the near future we propose combining these two outcomes to fabricate devices such as SQUIDs by employing focused ion beams to directly write structures in the superconducting films. (author)