A new publication titled “Symmetry-Induced Stability in Alkali-Doped Calcium Silicate Hydrate” was published in The Journal of Physical Chemistry C in May 2019.
Using first-principles quantum chemistry calculations on the model crystalline phase clinotobermorite, it was shown that there is a strong interplay between the thermodynamic stability of alkali-doped C-S-H and the symmetry of the alkali atoms in the structure. The article can be accessed here.