Figure 3. Artistic representation of Polycrystal structure.

Globally disordered structures comprised of frustrated grains locally ordered in crystalline configurations. They are characterized by a wide distribution of voids characteristic length scales that reflect disorder properties. This suggests, according to the CTRW framework, that an effective anomalous diffusion process should be detected in such systems. This means that a straight relation between the properties of structural disorder and diffusion in the hindered regime exists. Unlike O_D, the dNMR parameter α embodies information about the properties of structural disorder in an effective way and allows to identify the structural transition from rigid but unstressed random jamming to stressed polycrystal structure (see Fig. 5-b and Fig. 6).