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>O; 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 formukan'(EAc+ EA)VcNACalculate the atormic packing factor for Al>O1, 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.

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(a) For refractory ceramic materials, cite two characteristics that improve with and two characteristics that are adversely affected by increasing porosity.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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