Effect of MnO ₂ on the Piezoelectric Properties of the 0.75Pb(Zr _0.47 Ti _0.53 )O ₃ –0.25Pb(Zn _1/3 Nb _2/3 )O ₃ Ceramics

Abstract

MnO 2 was added to 0.75Pb(Zr 0.47 Ti 0.53 )O 3 –0.25Pb(Zn 1/3 Nb 2/3 )O 3 (0.75PZT–0.25PZN) ceramics in order to make a high‐power piezoelectric material. The Mn 4+ ion produced a defect dipole consisting of an Mn 4+ ion and an oxygen vacancy that transformed the 0.75PZT–0.25PZN ceramics into hard materials. The Q m value significantly increased with the addition of MnO 2 and reached a value of 1680 for the 1.5 mol% MnO 2 ‐added 0.75PZT–0.25PZN ceramic. Moreover, this specimen exhibited a high k p of 0.53 with a ɛ 3 T /ɛ 0 of 1518. Additionally, the 1.5 mol% MnO 2 ‐added 0.75PZT–0.25PZN ceramics sintered at 900°C for 4 h also exhibited high piezoelectric properties of Q m =1115, k p =0.50, and ɛ 3 T /ɛ 0 =1537.