5.3. A material of simple tetragonal Bravais lattice (a = 2.4 Å‚ c = 3.6 Å) is prepared in a plate shape so that the sample surface is parallel to (001). When the sample was symmetrically scanned in the 20 range from 20° to 100° using an X-ray beam at 1.54 Å, at which 20 positions will the diffraction peaks be observed? How will the diffraction pattern change if the sample is replaced by a crystal of body-centered tetragonal lattice? Assume that all the other condi-
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