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

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1) Which mathematical relationship is used to determine lattice parameters from diffraction data?

a: Scherrer equation Explanation

Explanation

b: Bragg’s law Explanation

Explanation

c: Lambert-Beer law Explanation

Explanation

d: Wien’s displacement law Explanation

Explanation

2) In a powder X-ray diffraction experiment, why is a powdered sample used instead of a single crystal?

a: To minimize background noise Explanation

Explanation

b: To ensure random orientation of crystallites for all possible diffraction angles Explanation

Explanation

c: To increase the penetration depth of X-rays Explanation

Explanation

d: To enhance fluorescence effects Explanation

Explanation

3) In Bragg's law, : nλ = 2d sin⁡θ, what does ‘λ’ represent ?

a: The lattice constant of the unit cell Explanation

Explanation

b: Distance between atoms in the unit cell Explanation

Explanation

c: Interplanar spacing between crystal planes Explanation

Explanation

d: The wavelength of the incident X-ray Explanation

Explanation

4) The most accurate method for determining lattice parameters involves:

a: Measuring the full-width at half maximum (FWHM) of peaks Explanation

Explanation

b: Using high-angle diffraction peaks and extrapolation techniques Explanation

Explanation

c: Comparing peak intensities Explanation

Explanation

d: Using only low-angle reflections 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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