Strontium and Barium Peroxides are shown to have the Calcium Carbide structure and the size of the unit cells is given by: Strontium Peroxide α = 5.02 Á, c = 6.55 Á. Barium Peroxide a = 5.34 A, c = 6.77 A.The structures are confirmed by density measurements and by the comparison between the calculated and observed intensities, the results in both cases being very satisfactory. The distance between the centres of the oxygen atoms in the Ο 2 -ion are shown to be :Strontium Peroxide d0_0 = 1.35 Á Barium Peroxide d^ = 1.29 Á.These distances are the length of the oxygen-oxygen single bond, the difference in the two cases being ascribed to contrapolarisation. Subject to allowances for this the length of the bond is taken to be : d^, = 1.31 ± 0.03 Á.
The microyielding behaviour of the monocrystalline nickel-base superalloy CMSX-6 has been studied experimentally in tensile tests up to small strains at 900 °C, 1000 °C and 1100 °C and by transmission electron microscopy of the deformed specimens. Inspection of the microyielding stress-strain curve with highly resolved plastic strain showed four distinct stages of deformation at the lowest temperature (900 °C) but not at the two higher temperatures. By considering the superposition of the external stress with the original coherency stresses and with the deformation-induced internal stresses and by inspection of the electron micrographs, these deformation stages could be assigned to successive dislocation glide processes in the horizontal and vertical -channels and, finally, in the ′-particles.
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