Plan-View TEM of the MgB2 film consisting of MgB2 and MgO.
The dark-field technique highlights isolated ~10 nm grains.
MgB2 Ring absences and the distribution of intensity
within the rings in selected area diffraction patterns (SADPs)
reveal the [0001] fiber texture.
(b) with the beam approximately parallel to the film surface
normal and
(c) tilted substantially away from the surface normal
Random orientation of ~10 nm grains in the plane of the film
plane implies a the high density of high angle grain boundaries
- Jc still greater than 106 A/cm²
TEM images by. Sample fabrication and properties published in:
C.B. Eom et al., Nature 411: 558-560, 2001
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