An approach to description of the structural types of phases is suggested, in accordance with which the structural types A15, C15 and C14 of Frank–Kasper phases are described as the densest packing of chains of special unions of tetrahedrons-tetrablocks. A tetrablock is a seven-vertex union of four tetrahedrons over faces. For the packing to be the densest, the ideal tetrahedrons in the tetrablocks should undergo a minimum possible deformation. Since a tetrablock is a natural structural unit of one-dimensional chains, the approach developed may be used for plotting structural models of phase transitions where the transformation develops within linear substructures. Chains of tetrablocks may also be structural components of metallic melts and glasses.

提出了一种描述相结构类型的方法，根据该方法，Frank-Kasper相的结构类型A15，C15和C14被描述为四面体-四嵌段特殊结合链的最密集堆积。四嵌段是在表面上由四个四面体组成的七个顶点的并集。为了使堆积最致密，四嵌段中的理想四面体应经受最小可能的变形。由于四嵌段是一维链的天然结构单元，因此开发的方法可用于绘制相变的结构模型，其中相变在线性子结构内发展。四嵌段的链也可以是金属熔体和玻璃的结构成分。