Electron hologram of a grain boundary (IMAGE) DOE/Argonne National Laboratory Caption Seeing the invisible: An electron hologram of a grain boundary in a lightly doped solid electrolyte sample from which electric potential at the grain boundary can be recovered. Credit Argonne National Laboratory 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.