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Materials characterization: method used to examine crystal structure (unit cell/space lattice) Identify the technique that directly reveals crystal structures in solids. Choose the correct option.

Difficulty: Easy

Naked eye inspection
Optical microscope
Metallurgical microscope
X-ray techniques (e.g., XRD)

Correct Answer: X-ray techniques (e.g., XRD)

Explanation:

Concept
X-ray diffraction (XRD) directly determines crystal structures (lattice type, lattice parameters) from diffraction patterns. Optical/metallurgical microscopes reveal microstructure (grains, phases) but not the atomic lattice.

Final Answer
X-ray techniques (e.g., XRD)

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