Department of Chemistry and Center for Advanced Engineering Fibers and Films, Howard L. Hunter Chemistry Laboratory, Clemson University, Clemson, South Carolina 29634-0973; Department of Physics and Astronomy, Kinard Laboratory, Clemson University, Clemson, South Carolina 29634-0978; and High Temperature Materials Laboratory, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6062 (At 2002-11-05)
