Electrical properties of alloyed junctions in InSb have been observed to depend significantly on crystallographic polarity. Junctions prepared by alloying to the face terminating in In atoms have consistently exhibited unusually low breakdown voltages not exceeding

volts. All high breakdown (10-16 volts) junctions were those prepared by alloying to the reverse (Sb) face. Reverse current also appears markedly higher in junctions prepared using the In surface. These observations correspond reasonably with Gatos, Moody and Lavine\´s report on InSb crystal growth indicating the dependence of single and dislocation free crystal growth on