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- W2008024898 abstract "Abstract Grain growth habits and the structure of grain boundaries have been investigated using transmission electron microscopy and scanning Auger microscopy of bulk sintered samples of orthorhombic Ba 2 YCu 3 O 7– x . This material exhibits typical transport critical currents of 40–500 A/cm 2 at 77 K and R = 0 T c ' s near 90 K. All grains of the correct phase have the characteristic reflection twin lamellar structure, but exhibit one of two growth habits: (1) small (1–5 μm diameter) equiaxed grains, and (2) larger (3–40 μm diameter) platelet-shaped grains with an aspect ratio between the twinned a – b plane dimension and the short c -axis dimension on the order of 6. Grain boundary structure falls into one of three classes: (1) tight boundaries with only a network of dislocations at the interface, characteristic of equiaxed grains and boundaries of platelet grains not involving the c -axis boundary, (2) basal-plane-faced boundaries of platelets involving introduction of dislocation loops on the c -axis side of the boundary only, with the depth of the penetration of the dislocation loops (50–1500 A) varying with degree of local strain, and (3) basal-plane-faced boundaries of platelets where severe local strain has produced substantial plastic deformation and generation of small voids, again with the depth of the boundary region a function of local strain. We propose a model for these observations based on the highly anisotropic thermal contraction of the material during cooling from the high sintering temperatures. Scanning Auger microscopy of in situ fractured surfaces reveals segregation of carbon at the grain boundaries at 1–4 monolayer level. These structures span the spatial range likely to cause weak-link coupling between grains as the source of low transport J c in polycrystalline bulk material." @default.
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- W2008024898 date "1987-12-01" @default.
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- W2008024898 title "On the defect structure of grain boundaries in Ba2YCu3O7–x" @default.
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- W2008024898 doi "https://doi.org/10.1016/0022-0248(87)90037-6" @default.
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