In the present work the PBCuNbO3-PbTiO3-PbZrO3 system is studied with
MnO2 additions to increase the quality factor (Qm). The samples were p
repared using the hot pressing technique. X-ray pattern shows two peak
s. These are due to tetragonal and rhombohedral phases. The intensity
ratio of the (200) and (002) peaks is opposite with respect of that re
ported by H.T. Chung and H.G. Kim [1]. Aging tests show the degradatio
n of samples kept at room temperature for several years.