long period structure
long period structure
For example, in the phase of CuAuⅠ, five ordered lattices are aligned in a direction followed by another five ordered lattices with an anti-phase shift to the former lattices, resulting into formation of a structure with a unit of 10 times larger than the original lattice. Such a structure is called a "long period structure." The phase CuAuⅠ appears in a narrow temperature range between the ordered phase and the disordered phase. In a diffraction pattern, the reflections from the ordered phase split to diffraction spots appearing at the positions corresponding to a period of 10 times that of the ordered phase. Long period structures appear in intermetallic compounds and SiC.
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