Alkaline Earth Chalcogenides (IMAGE) DOE/Ames National Laboratory Caption Unit cells and electron micrographs of alkaline-earth chalcogenide (AeCh) nanocrystals. Credit U.S. Department of Energy Ames National Laboratory Usage Restrictions With credit to U.S. Department of Energy Ames National Laboratory. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.