Abstract
Transmission electron microscopy (TEM) techniques have been employed to study the room temperature solid state form of chromatographically purified C70. Tilting and electron diffraction experiments in three-dimensional reciprocal space, on samples prepared by crystallization from several different solvents, show that C70 crystallites adopt hexagonal close packed (hcp) structure with a = 1.01 ± 0.05 nm and c = 1.70 ± 0.08 nm. The extinctions and observed reflections conform to the P63/mmc space group. High resolution TEM images reveal the molecular order and periodicity associated with C70 crystallites in real space. The experimental results are in agreement with the preliminary computations of crystal structure within acceptable error limits.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 2440-2446 |
| Number of pages | 7 |
| Journal | Journal of Materials Research |
| Volume | 7 |
| Issue number | 9 |
| DOIs | |
| State | Published - Sep 1992 |
Funding
This work was supported by the URGC through Northwestern University (VPD) and the National Science Foundation through the Northwestern University Materials Research Center, Grant No. DMR 8821571 (VPD and MMK). VPD acknowledges additional support from the National Science Foundation through the Science and Technology Center for Superconductivity (STCS), Grant No. DMR 8809854. We thank Ray Meilunas for performing the Raman measurements.
ASJC Scopus subject areas
- General Materials Science
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering