Presentation on theme: "Materials Science and Engineering Crystalline and Non-Crystalline Systems X-Ray Diffraction: Determination of Crystal Structure."— Presentation transcript:
Materials Science and Engineering Crystalline and Non-Crystalline Systems X-Ray Diffraction: Determination of Crystal Structure
Crystalline and Non-Crystalline Single Crystals ◦ Uninterrupted repeating unit of a unit cell ◦ Often forms geometric shapes ◦ Most solids form multiple crystal orientations and breaks forming grains
Crystalline and Non-Crystalline Polycrystalline ◦ Many crystalline grains in a microstructure ◦ Is heavily influenced by cooling. Nucleation, Growth, and Formation of Boundaries (figure 3.18) ◦
Crystalline and Non-Crystalline Anisotropy ◦ Axis/Direction determines properties (structure – properties correlation) Isotropy – Equal properties on all axis. ◦ Example: Young’s Modulus, Conductivity, Index of Refraction can vary between  and 
Crystalline and Non-Crystalline Anisotropy ◦ Inversely proportional to structural symmetry Triclinic vs Simple Cubic Highly anisotropic (directional dependant properties) vs Highly Isotropic (uniform shape = uniform properties) ◦ Usually see isotropy on macroscopic scale in metals due to polycarystallinity
X-Ray Diffraction Most of the information in this chapter comes from X-Ray Diffraction. What is diffraction!?
X-Ray Diffraction Diffraction ◦ Results from constructive and destructive interference
X-Ray Diffraction Diffraction ◦ Consistent overlap in 3-D space creates “diffraction pattern” ◦ Used heavily in research and higher education
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