Sm 2 O 3 ‐modified Pb(Ni,Ta)O 3 –Pb(Zr,Ti)O 3 –MnO 2 ceramics with high piezoelectric and electromechanical coupling properties

Abstract The emerging electromechanical equipment urgently needs piezoelectric materials with a high mechanical mass factor ( Q m ) and large piezoelectric coefficient ( d 33 ), large electromechanical coupling coefficient k p , and good temperature stability. Unfortunately, the Q m of piezoelectric ceramics is inversely proportional to d 33 , which limits their practical application. If the appropriate acceptor and donor dopants can be added to the piezoelectric ceramics, high Q m and large d 33 can be achieved simultaneously. Here, we try to achieve high mechanical mass factor and good electromechanical coupling coefficient in 0.12Pb(Ni 1/3 Ta 2/3 )O 3 –0.44PbZrO 3 –0.44PbTiO 3 (PNT–PZT) ceramics by co‐doping Sm 2 O 3 and MnO 2 without sacrificing the piezoelectric constant. PNT–PZT–Mn– x Sm ceramics were prepared by conventional sintering method. When Q m = 828, d 33 = 449 pC/N, FOM = 3.72 × 10 5 , T C = 264°C, and k p = 0.6158, the performance of PNT–PZT‐Mn‐0.015Sm ceramics is the best. The high Q m is related to the hardening effect of doped MnO 2 , and the high piezoelectric activity is related to the doping of Sm 2 O 3 .