<p>Abstract</p> <p>The symmetry properties of the single-walled BC<sub>2</sub>N nanotubes were investigated. All the BC<sub>2</sub>N nanotubes possess nonsymmorphic line groups. In contrast with the carbon and boron nitride nanotubes, armchair and zigzag BC<sub>2</sub>N nanotubes belong to different line groups, depending on the index n (even or odd) and the vector chosen. The number of Raman- active phonon modes is almost twice that of the infrared-active phonon modes for all kinds of BC<sub>2</sub>N nanotubes.</p
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