Lu, Hsiao-MingHardy, J. R.2017-04-251992Lu, H. M., and J. R. Hardy. 1992. “Phase Transitions inK2ZnCl4.” Physical Review B 46 (13) (October 1): 8582–8585. doi:10.1103/physrevb.46.8582.0163-1829http://nrs.harvard.edu/urn-3:HUL.InstRepos:32416127It is shown that the potential-energy surface in K2ZnCl4 contains a double-well structure, very similar to some of the other A2BX4 compounds (e.g., K2SeO4, Rb2ZnCl4), except that the double well is much deeper and broader, giving rise to a highly disordered high-temperature phase as observed experimentally. A lattice-dynamics study of the Pna21 structure shows an instability with the wave vector q=0.5b*+(0.5±δ)c*, providing an explanation to the incommensurate phase transition reported recently.en-USJournal Article2017-03-2219922017-04-2510.1103/PhysRevB.46.8582