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Determination of Precise Lattice Parameter of FCC and BCC phases using X-ray diffraction

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1) Which factor most strongly affects the precision of lattice parameter determination in XRD?

a: Sample thickness Explanation

Explanation

b: Peak position accuracy Explanation

Explanation

c: Peak intensity Explanation

Explanation

d: Background noise Explanation

Explanation

2) The use of high-angle diffraction peaks improves lattice parameter accuracy primarily because:

a: They have higher intensity Explanation

Explanation

b: Instrumental broadening is reduced Explanation

Explanation

c: Δd/d decreases with increasing θ Explanation

Explanation

d: absorption effects are minimized Explanation

Explanation

3) Which systematic error causes a uniform shift in all diffraction peaks?

a: Preferred orientation Explanation

Explanation

b: Zero shift error Explanation

Explanation

c: Crystallite size effect Explanation

Explanation

d: Microstrain Explanation

Explanation

4) The Nelson–Riley function is used to:

a: Correct peak broadening Explanation

Explanation

b: Separate strain and size effects Explanation

Explanation

c: Extrapolate lattice parameters to θ = 90° Explanation

Explanation

d: Index unknown diffraction peaks Explanation

Explanation

5) What does the '2θ' value in an XRD plot represent?

a: The angle of incident X-rays Explanation

Explanation

b: The angle between the incident and diffracted X-rays Explanation

Explanation

c: The atomic number of the elements in the sample Explanation

Explanation

d: The temperature at which the sample is analysed Explanation

Explanation

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