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The Doppler-broadening of the positron annihilation line in 5N indium has been studied over the temperature range 77 K to 427 K. No evidence for self-trapping has been discovered; rather, the prevacancy rise in the F-parameter appears linear. The best value for EV is 0.59±0.03 eV. 相似文献
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Natalya Kostromina Hlaing Zawoo Vladimir Osipchik Ksenia Yakovleva Margarita Baranova 《Journal of Macromolecular Science: Physics》2020,59(10):648-658
AbstractThe effects of filling an epoxy matrix modified with “Viniflex” with carbon nanotubes, fullerene C60, or graphene on the mechanical properties, surface morphologies and glass transition temperatures of the composite materials obtained after curing were studied. It was shown that the largest decrease in glass transition temperature and an increase in impact strength was achieved by the introduction of 0.1 mass% graphene. Filling with graphene and carbon nanotubes increased the bending strength while filling with C60 fullerenes provided the greatest compressive strength and elasticity modulus. An explanation of the results was based on ideas about the relationship of the geometrical shape of the nanofiller to the load direction and features of the phase composition of the composite materials. It is suggested that the carbon nanomaterials had a template effect on the packing of the epoxy matrix chains. 相似文献
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