Published in Physical Review B, Volume 28, Issue 11, December 1, 1983, pages 6589-6591.
Copyright © 1983 American Physical Society. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Physical Society. The following article appeared in Physical Review B
NOTE: At the time of publication, the author Richard B. Frankel was not yet affiliated with Cal Poly.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevB.28.6589.
Both Fe3+ and Fe2+ ions occur in FeCl3-doped polyacetylene. At low dopant levels (2+ and Fe3+ ions are paramagnetic down to 4.2 K. At dopant levels >0.01 mole fraction, there is evidence from Mössbauer spectroscopy that Fe2+ ions associate into aggregates which are magnetically ordered below 25 K. Aggregate formation appears to correlate with high electrical conductivity.