Stress-dependent electromechanical properties of doped (Ba1−xCax)(ZryTi1−y)O3

摘要: Abstract The effect of 1 at% Fe- and FeNb-doping on the temperature stress stability electromechanical properties (Ba 1− x Ca )(Zr y Ti )O 3 (BCZT) was investigated. For composition 0.89 0.11 0.135 0.865 with rhombohedral symmetry, doping reduces Curie point large-signal significantly. piezoelectric coefficient d 33 * at room reduced to 500 pm/V compared 700 pm/V in undoped 1 kV/mm. electrostrain, however, found be less sensitive mechanical prestresses, showing a plateau up stresses 80 MPa both doped compositions. These effects were attributed reduction domain wall mobility due smaller grain size, charged defect dipoles proximity room-temperature measurements ferroelectric-paraelectric phase transition temperature. study reveals that exceptionally large strains observed BCZT rely instabilities around polymorphic system. Aliovalent changes this system electrostrain considerably.