THERMAL-EXPANSION OF CLATHRASIL PYROLIDENE DODECASIL-3C

The thermal expansion of a synthetic pyrolidine dodecasil-3C (D3C) cla thrasil from 15 to 300 K has been determined from high-resolution diff raction patterns obtained with synchrotron radiation. The thermal expa nsivity is found to be significantly larger than that of alpha-quartz. A larger thermal expansivity indicates greater anharmonicity in the i nteraction potentials. This observation suggests that the clathrasils may exhibit anomalous glassy solid behavior analogous to that found in clathrate hydrates.