(a) - 5 In general, the magnitude of q' is different from the formal charge. For example, in NaCl, qis 0.74e instead of

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A 5 In General The Magnitude Of Q Is Different From The Formal Charge For Example In Nacl Qis 0 74e Instead Of 1 (49.19 KiB) Viewed 28 times

(a) - 5 In general, the magnitude of q' is different from the formal charge. For example, in NaCl, qis 0.74e instead of e. Explain the reason. (b) -5 Write the equations of motion for each atom, when an alternating electric field is applied to the crystal. (Hint: like Eq. (18) in Ch. 4.) (C) -10 Use a plane wave for the electric field and displacements and the fact that in the long wavelength limit all similar atoms have the same displacement. Find the following equation. - oʻu, =-ou, + q'E M where M: the effective mass and Oy: transverse frequency at the long wavelength limit. (d) -5 Using the definition of the ionic polarization P = Nquo, find the Eq. (54). = =