Copper Ions and Crystals (IMAGE) Duke University Caption An artistic rendition of the intriguing superionic crystalline structure of CuCrSe2, which has copper ions that move like liquid between solid layers of chromium and selenium, giving rise to useful electrical properties. Credit Oak Ridge National Laboratory/Jill Hemman Usage Restrictions None License Licensed 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.