Hydrogen Vacancy Clustering (IMAGE) University of California - Santa Barbara Caption Hydrogen vacancy clustering in aluminum hydride (AlH3): The dark blue atoms represent the Al atoms in the regular AlH3 lattice, and the light blue atoms represent the Al atoms in the Al-rich region created by the clustering of hydrogen vacancies as hydrogen leaves the material. Credit Van de Walle Group 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.