Structure of boron nitride nanoscale cones: Ordered stacking of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>240</mml:mn><mml:mi>°</mml:mi></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>300</mml:mn><mml:mi>°</mml:mi></mml:math>disclinations

Recently discovered boron nitride (BN) nanoscale cone particles are shown to consist of an ordered stacking of seamless conical shells. High-resolution transmission electron microscopy and nanobeam electron diffraction allowed the orientation of the BN hexagonal rings to be determined. In all but one case, the results conformed with a model of orderly stacked $240\ifmmode^\circ\else\textdegree\fi{}$ disclinations, which is the smallest cone geometry ensuring the presence of B-N bonds only. One case of a nanoscale cone constituted of $300\ifmmode^\circ\else\textdegree\fi{}$ disclinations was found, implying that structures containing line defects of non-B-N bonds may form.

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