Piezoelectric buzzers, acoustic sounding and alarming systems render advantage of compact and high frequency design in replacing electromagnetic systems. However, the traditional PZT ceramics have lower dielectric permittivity and higher temperature dependence (-40~85ºC) hardly meeting the key requirements. The authors systematically studied solid solutions of PZT and Pb(Ni1/3Nb2/3)O3 (PNN) by varying PNN/PZT ratio and the corresponding Zr/Ti ratio to obtain the stable permittivity compositions. Effectively controlling the dielectric permittivity around 2000 with the minimal temperature dependence below +/- 6% using lower PNN/PZT ratio outperforms the piezoceramic performance in the market. The authors investigated the phase transition behaviours from tetragonal to rhombohedral structure by increasing the Zr/Ti ratios and temperatures using X-ray diffraction and Electron microscopy techniques.