Direct observation of nanometer-scale Mg- and B-oxide phases at grain boundaries in MgB2

R. F. Klie; J. C. Idrobo; N. D. Browning; K. A. Regan; N. S. Rogado; R. J. Cava

doi:10.1063/1.1404127

Direct observation of nanometer-scale Mg- and B-oxide phases at grain boundaries in MgB₂

R. F. Klie, J. C. Idrobo, N. D. Browning, K. A. Regan, N. S. Rogado, R. J. Cava

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88 Scopus citations

Abstract

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 MgB₂. 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_x phases smaller than the coherence length, while others contain larger areas of MgO sandwiched between BO_x layers. Such results naturally explain the differences in connectivity between the grains observed by other techniques.

Original language	English (US)
Pages (from-to)	1837-1839
Number of pages	3
Journal	Applied Physics Letters
Volume	79
Issue number	12
DOIs	https://doi.org/10.1063/1.1404127
State	Published - Sep 17 2001

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1404127

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abstract = "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 MgB2. 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 BOx phases smaller than the coherence length, while others contain larger areas of MgO sandwiched between BOx layers. Such results naturally explain the differences in connectivity between the grains observed by other techniques.",

author = "Klie, {R. F.} and Idrobo, {J. C.} and Browning, {N. D.} and Regan, {K. A.} and Rogado, {N. S.} and Cava, {R. J.}",

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AU - Klie, R. F.

AU - Idrobo, J. C.

AU - Browning, N. D.

AU - Regan, K. A.

AU - Rogado, N. S.

AU - Cava, R. J.

PY - 2001/9/17

Y1 - 2001/9/17

N2 - 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 MgB2. 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 BOx phases smaller than the coherence length, while others contain larger areas of MgO sandwiched between BOx layers. Such results naturally explain the differences in connectivity between the grains observed by other techniques.

AB - 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 MgB2. 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 BOx phases smaller than the coherence length, while others contain larger areas of MgO sandwiched between BOx layers. Such results naturally explain the differences in connectivity between the grains observed by other techniques.

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 12

ER -

Direct observation of nanometer-scale Mg- and B-oxide phases at grain boundaries in MgB₂

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