An orientational ordering transition was observed near 260 K from a C70 film in a temperature-dependent Raman study. The 1183 cm-1 Raman band shows a rather dramatic change in both frequency and bandwidth over the range of 220-280 K. The low-frequency Raman band at 260 cm-1 disappears, and at its expense, a new band emerges at 266 cm-1 as the temperature is decreased. The relatively smooth transition in temperature is attributed to the stacking disorder in molecular packing and the nonuniform orientational conformation of C70 solid.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry