OAK RIDGE, Tennessee, Sept. 9 -- The U.S. Department of Energy's Oak Ridge National Laboratory issued the following news release: Researchers at the Department of Energy's Oak Ridge National Laboratory have found a chemical "chameleon" that could improve the process used to purify rare-earth metals used in clean energy, medical and national security applications. The study, performed in collaboration with Vanderbilt University, is the latest of many efforts by ORNL's Chemical Sciences Divisio  more