TTF-TCNQ single crystals have been grown under microgravity conditions
from solutions of TTF and TCNQ in acetonitrile in experiments perform
ed on the NASA Long Duration Exposure Facility. Their habit is very di
fferent from that obtained previously. The crystals are rectangular pl
ates with the crystallographic b axis perpendicular to the plate. That
is contrary to ground-based crystal growth experiments, in which the
b axis is the preferred direction of growth.