Temperature Characteristics of Electrostrictive Strain in PMN-Based Electrostrictive Ceramics

The electrostrictive strain, hysterestic (S - E) nature and remanent strain effect were investigated in their diffuse phase transition temperature rang for two kinds of La-doping PMN-based ceramics with the diffuse phase transition center temperature 40℃ and 65℃ respectively. The experimental results show that for the material with diffuse phase transition center temperature 40℃, its strain and hysteresis decrease as temperature increases in the range of -10℃ to 60℃ driving by 0-1kV/mm one direction field, and for the other material whether driving by ±1kV/mm AC field or 0-1kV/mm one direction field the strains exhibit a peak value with temperature change from 13℃ to 41℃, the remanent strain and hysteresis decrease monotonically with temperature increase. Above experimental results were also explained in detail.