(e) The XRD pattern for the material produced in part (c) is shown in Fi below. The XRD pattern was collected using Cu K

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E The Xrd Pattern For The Material Produced In Part C Is Shown In Fi Below The Xrd Pattern Was Collected Using Cu K 1 (84.72 KiB) Viewed 7 times

(e) The XRD pattern for the material produced in part (c) is shown in Fi below. The XRD pattern was collected using Cu Ka radiation. 3 Peak Phase 20 () (hkl) 1 42.94 (121) 1 43.83 (210) 2 44.67 1 44.99 (103) 1 45.94 (211) 48.59 (113) 49.16 (122) Intensity (arbitrary units) 12345678 11 3/11 1 1 12 2 65.02 42 44 52 54 56 62 64 66 20 (*) Figure Q1 The XRD pattern has been partially analysed, with the identification of two constituent phases, labelled as Phase 1 and 2 detailed in the table above. Each peak, which is labelled, has the 20 value listed in the accompanying table, and is identified as being part of Phase 1 or 2. Phase 2 is a cubic structure with a = 2.87 A, Phase 1 is not cubic in structure. (i) Calculate the d-spacing to two decimal places for Peaks 1 and 2, the first two peaks present in the scanned region for Phase 1. [2 marks] (ii) According to the database, Phase 1 is not cubic and there should be additional peaks, the (002) and (202) peaks. Suggest two reasons why these peaks are not immediately apparent in the XRD plot and table. [2 marks] (iii) Phase 2 is cubic; however, it is not primitive cubic. Using peaks 3 and 8, determine which type of cubic unit cell Phase 2 is. [3 marks] (iv) Draw the unit cells for the Miller indices identified for peaks 3 and 8. [1 mark] (v) Determine the Miller indices for the next peak at higher 20 for Phase 2 and calculate the 20 value to the nearest degree this will be detected at. [3 marks]