Abstract PZT 95/5, doped with approximately 0.8 weight percent Nb2O5, is used in shock-activated pulsed power supplies. During processing, the ferroelectric ceramic is cycled through the FE1-FE2 phase transition (∼70°C) several times (oven drying, heat aging, etc.). Microcracking occurs within the ceramic as a result of the volume change (∼0.1 percent) associated with this phase transition. A constant level of Nb2O5 (1.5 weight percent) was added to PZT 95/5 and six additional compositions near PZT 95/5 in an attempt to produce a composition whose FE1-FE2 transition temperature would be well above 70°C.