Abstract
The influence of uniaxial compressive stress on the oxygen ion and mixed conductivity of Zr_<0.82>Y_<0.18>O_<1.91>, Ce_<0.9>Gd_<0.1>O_<1.95-δ>,Yba_2Cu_3O_<7-δ>,and La_2NiO_<4+δ> were investigated by using AC 4 probe method under controlled oxygen partial pressure condition. The applied compressive stress was ranged from 0 Mpa to 350 MPa for these specimens in air at 600℃. In order to clarify the reason for the phenomenon of conductivity change, the mixed conductivity of Ce_<0.9>Gd_<0.1>O_<1.95-δ> for the application of stresses were measured under reducing conditions. The experimental result revealed that as the application compressive stress increases, the carrier concentration remain steady, whereas the mobility decreases. The conductivity was decreased with increasing compressive strain, this trend agreed with that of the simulation results. Therefore, the decrease of mobility was considered to be the reason for the decline conductivity under compressive strain/stress conditions.
