English: Probabilitiy in the lower part and energy above in terms of an order parameter 𝑄6 and temperature 𝑇. At low temperature the decahedral structure (Dh) is the global free energy minimum, but as the temperature increases the higher entropy of the competing structures based on incomplete icosahedra (Ic) causes the finite system analogue of a first order phase change; at even higher temperatures a liquid-like state is favored.