Ice polyamorphism in the minimal Mercedes-Benz model of water
  We investigate ice polyamorphism in the context of the two-dimensional Mercedes-Benz model of water. We find a first-order phase transition between a crystalline phase and a high-density amorphous phase. Furthermore we find a reversible transformation between two amorphous structures of high and low density; however we find this to be a continuous and not an abrupt transition, as the low-density amorphous phase does not show structural stability. We discuss the origin of this behavior and its implications with regard to the minimal generic modeling of polyamorphism. 
Julyan H. E. Cartwright, Oreste Piro, Pedro A. S\'anchez, Tom\'as   Sintes
cond-mat.mes-hall cond-mat.dis-nn nlin.AO