Question

For the accurate measurement of the d-spacings which of the following method is best to use?

(a) Stockbarger method

(b) Refractometry method

(c) Diffractometry method

(d) Dalton method

I have been asked this question in unit test.

This intriguing question comes from Modern X-Ray Powder Techniques and their Applications in division X-Ray Diffraction of Solid State Chemistry

Answer 1

The correct answer is (b) Refractometry method

To elaborate: In order to measure the d-spacings accurately, Diffractometry is normally regarded as the best method and most of the patterns in the powder diffraction file gave been obtained by the Diffractometry. An internal standard of accurately known d-spacings must be added to the sample in order to eliminate the instrumental error.