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The linear coefficient of the radial thermal expansion has been measured on asystem of SWNT bundles in an interval of 2.2 - 120K. The measurement wasperformed using a dilatometer with a sensitivity of 2*10-9 cm. The cylindricalsample 7 mm high and 10 mm in diameter was obtained by compressing powder. Theresulting bundles of the nanotubes were oriented perpendicular to the sampleaxis. The starting powder contained over 90% of SWNTs with the outer diameter1.1 nm, the length varying within 5-30 um.

Radial thermal expansion of single-walled carbon nanotube bundles at low temperatures