SEM Micrograph of CCTO (image) American Institute of Physics Caption The photograph shows clearly the large grains closely packed together and separated by well-defined grain boundaries. The density of the CCTO ceramic is 94 percent of the maximum theoretical density, indicating the superior nature of the samples. Credit R. K. Pandey/Texas State University Usage Restrictions This image may be used only with appropriate caption and credit. 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.