Cd x Zn 1 - x Te crystals grown by high-pressure Bridgman are promising for nuclear detection and are already widely used and studied for this application. Phase precipitation is identified for the first time in such HPB grown crystals, more or less pronounced depending on the samples studied. TEM images and electron diffraction patterns are presented. The possible relationships with nuclear detection performance and defect energy levels are discussed in the light of nuclear spectrometry, PICTS, TSC and TEES.