New clathrate-based phase-change materials with cage-like structures incorporating Cs and Ba guest atoms, are reported as a means of altering crystallization and amorphization behavior by controlling 'guest-cage' interactions via intra-complex guest vibrational effects. Both a high resistance to spontaneous crystallization, and long retention of the amorphous phase are achieved, as well as a low melting energy. This approach provides a route for achieving cage-controlled semiconductor devices.
Loke, D., Skelton, J. M., Law, L-T., Wang, W-J., Li, M-H., Song, W-D., Lee, T-H., & Elliott, S. R. (2014). Guest-cage atomic interactions in a clathrate-based phase-change material. Advanced Materials, 26(11), 1725-1730. https://doi.org/10.1002/adma.201304199