A series of 2D block lattices constructed by identical building elements and having asymmetric interaction forces is proposed as a generalisation of the well-known Kossel crystal. Different polymorph structures are created depending on the mutual orientation of the neighbour elements. The lattice energy for some of them is calculated at low temperatures using the repeatable step of blocks (monomers, dimers, quadrumers). A variety of “surface” structures (including alternating “surfaces”) is established. The corresponding coexisting equilibrium forms are determined following the method of Stranski and Kaischew. The thermodynamic stability of these polymorph structures is discussed. An orientation order/disorder surface transition is expected to appear as a novel phenomenon at high temperatures.

Keywords: block lattice models, equilibrium form, lattice energy, “surface” structure, polymorph crystals, surface order/disorder transition

---

The full text of this paper in pdf-Format:

If you came directly to this page, click this symbol to go to the homepage of CRT.