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- Verify that the lowest value of the radius ratio for (a) sixfold coordination is 0.414, and (b) for eightfold coordination is 0.732.What point defects are possible for Al2O3 as an impurity in MgO? How many Al3+ ions must be added to form each of these defects? Explain.Why are there only 10 2D plane point groups n crystallography?
- When substituting two Ca2+ cations in CaCl2 using two Na+ cations, what defects could be generated in order to obey the charge neutrality? Choose one from A-E: i). two Cl- interstitials ii). two Cl- vacancies iii). one Ca2+ vacancy iv). two Ca2+ interstitialsTwo coordination spheres for MnCl3(CN)3Why is it necessary to use the Ka transition (2p-----> 1s) in copper (see Problem 88) to generate X-rays? Why not use, for example, the 4s--->3p transition?
- 3. Describe the structures of the following borate glasses. How manyNBO are present for each glass? What percent of the boron ions arein ‘!-fold coordination?(a) Vitreous boric oxide(b) 10 Na20-90 B203(c) 33.2 Na,0-66.7 B203(d) 50 Na20-50 B203State the Miller indices of the planes that intersect the crystallographic axes at the distances (−a, 2b, −c) and (a, 4b, −4c).Plz fast solve this question List the point symmetry elements for the cubic (43m). The photos included show geometry. The elements I am looking for are reflection, rotations, inversion. Please list these clear and simple. Thank you
- In a certain Patterson map for an orthorhombic crystal, space group P222, with coordinates of equivalent positions at x,y,z; x,y,-z, -x,-y,1/2+z, -x,y,1/2-z, there were high peaks at u,v,w of 0,0,0.74; 0.6,0,0; 0,0.36,0.25, assuming one heavy atom per asymmetric unit, find the coordinates of this heavy atom.State the Miller indices of the planes that intersect the crystallographic axes at the distances (2a, 3b, 2c) and (2a, 2b, ∞c).determine the value of Ksp for Zn3(PO4)2 by constructing an ICE table.