Question Seven(a) For refractory ceramic materials, cite two characteristics that improve with and two characteristicsthat are adversely affected by increasing porosity.(b) Show that the minimum cation-to-anion radius ratio for a coordination number of 4 is 0.225.(Hint: Use the AX crystal structure, assuming the anion spheres touch in plane).(c) The unit cell for Al>Os has hexagonal symmetry with lattice parameters a = 0.4759 nm and c 1.2nm. If the density of this material is equal to 3.99 g/cm' and is calculated according to the formulan'(E Ac+ EAA)V.NACalculate the atomic packing factor for Al>O, given that the ionic radius for AI is 0.053 nm and i0' is 0.140 nm. Take N, = 6.023 x 1023 atoms/mole.(d) Mention any three industrial ceramics and indicate their applications.

Answered: (c) The unit cell for Al;03 has…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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