
%0 Journal Article
%A Kelland, SB 
%T Twenty-vertex Model on a Triangular Lattice
%J Australian Journal of Physics
%D 1974/12/01
%V 27
%N 6
%P 813-830
%K 
%R https://doi.org/10.1071/PH740813
%U https://www.publish.csiro.au/paper/PH740813 
%X An ice-type vertex model is formulated on a triangular lattice and solved exactly for restricted values of the vertex activities. It is found to undergo an infinite-order phase transition into an ordered antiferroelectric state and a first-order phase transition into a 'frozen' ferroelectric state. 
