Understanding the Working Principle of X-Ray Diffraction (XRD)

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XRD is one of the most powerful analytical techniques used to characterize crystalline materials. Whether in pharmaceuticals, chemicals, materials science, geology, or nanotechnology, XRD provides critical insights into the arrangement of atoms within a crystal lattice.

📌 How does XRD work?

When monochromatic X-rays interact with a crystalline sample, they are diffracted by the regularly spaced atomic planes. Constructive interference occurs only at specific angles that satisfy Bragg’s Law:

nλ = 2d sinθ

Where:

• λ = X-ray wavelength

• d = Interplanar spacing

• θ = Diffraction angle

• n = Order of diffraction

The resulting diffraction pattern acts as a unique fingerprint of the material, enabling scientists to:

✅ Identify crystalline phases

✅ Determine crystal structures

✅ Measure lattice parameters

✅ Evaluate crystallinity

✅ Estimate crystallite size

✅ Detect polymorphic forms

In pharmaceutical research, XRD plays a crucial role in polymorph characterization, quality control, and solid-state form identification.

Despite being over a century old, XRD remains one of the most indispensable techniques in modern analytical science.

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