Reduced dielectric loss and high piezoelectric constant in Ce and Mn co-doped BiScO3-PbCexTi1-xO3-Bi(Zn0.5Ti0.5)O3 ceramics.

MnO 2 -doped 0.99(0.36BiScO 3 -0.64PbTi 1- x Ce x O 3 )-0.01Bi(Zn 0.5 Ti 0.5 )O 3 (BS-PTC-BZT-MnO 2 ) ceramics are fabricated by the solid-state method. Here, it's firstly reported that Ce element can reduce dielectric loss (tan δ ) and suppress the decrease of piezoelectric constant ( d 33 ) simultaneously. Effects of Ce contents on the structure and electrical properties of BS-PTC-BZT-MnO 2 ceramics are studied. The ceramics ( x  = 0.02) with MPB (rhombohedral-tetragonal) possess low dielectric loss (tan δ  = 1.36%, 1 kHz) and high piezoelectric constant ( d 33 = 360 pC/N) simultaneously, which is superior to most reported BS-PT. Besides, excellent comprehensive properties including high Curie temperature ( T C = 422 °C), large dielectric constant ( ɛ r = 1324), and high remnant polarization ( P r = 35.1 µC/cm 2 ) are obtained. Asymmetric S-E and P-E hysteresis loops indicate that defects and oxygen vacancies are induced by multi-valence elements (Ce and Mn), which is the origin for reducing tan δ . In addition, good thermal stability of piezoelectric and dielectric properties is observed. These results indicate that Ce and Mn co-doped BS-PTC-BZT-MnO 2 ceramics can be well applied as power electronic devices under high temperature. [ABSTRACT FROM AUTHOR]