Oxides with the Cubic Rare-Earth Sesquioxide Structure

1 Oxides with the Cubic Rare-Earth Sesquioxide Structure 

The (110) dislocations are dissociated into four 1/4(110) collinear partials. The SFE of the middle fault is surprisingly low ( 80 mj m ), and it is suggested that this is because only the fourth plane-plane interactions are changed by the fault [178]. For Er203 single crystals [35, 179], temperatures in excess of 1600 °C and stresses of 100 MPa were required for plastic deformation at a strain rate of 10 s . Only (111) 110 slip was observed. The 1/2(111) dislocations were found to be dissociated according to Eq. (21), and the authors pointed out that the partial Burgers vectors connect cation positions in the structure. 

The ribbon width is variable and involves both glide and dimh, so that it may he nonequilibrium. The 1/4(111) fault vector causes initially empty sites in the perfect structure to he filled hy tetrahedral and dodecahedral cations, so that the SFE should be high. Equation (22) could not he detected in dislocations introduced into silicate 

---