In summary, the amount of crystallinity in a material affects diffusion by influencing the structural order, diffusion pathways, and energy barriers. Highly crystalline materials typically exhibit faster and more predictable diffusion properties due to their ordered structure and well-defined pathways, whereas amorphous materials may have slower and less predictable diffusion because of their disordered nature. However, it's important to note that the specific diffusion behavior can vary depending on the material's composition and other factors such as temperature, impurities, and defects