Direct observation of nanometer-scale Mg- and B-oxide phases at grain boundaries in MgB[sub 2]

Klie, R. F.; Idrobo, J. C.; Browning, N. D.; Regan, K. A.; Rogado, N. S.; Cava, R. J.
September 2001
Applied Physics Letters;9/17/2001, Vol. 79 Issue 12, p1837
Academic Journal
Here we describe the results of an atomic resolution study of the structure and composition of both the interior of the grains, and the grain boundaries in polycrystalline MgB[sub 2]. We find that there is no oxygen within the bulk of the grains but significant oxygen enrichment at the grain boundaries. The majority of grain boundaries contain BO[sub x] phases smaller than the coherence length, while others contain larger areas of MgO sandwiched between BO[sub x] layers. Such results naturally explain the differences in connectivity between the grains observed by other techniques. © 2001 American Institute of Physics.


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