Homework 4 Solutions - Homework #4 Solutions Chapter 11...

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Chapter 11 Question 11.4 What two main factors affect the packing of ions in ionic solids? Answer 11.4 The two main factors which affect the packing of ions in ionic solids are: 1. The relative size of the ions in the ionic solids, assuming the ions are hard spheres with definite radii; 2. The need to balance the electrostatic charges to maintain electrical neutrality within the ionic solid. Question 11.47 How is a glass distinguished from other ceramic materials? Answer 11.47 Unlike all other ceramic materials, glass constituents are heated to fusion and then cooled in the rigid state without crystallization. As a consequence, glass has an amorphous structure rather than crystalline. Question 11.48 Define the glass transition temperature. Answer 11. 48 The glass transition temperature, T g , is the temperature at which the two slopes of a glass specific volume versus temperature curve intersect. Physically this temperature falls within the narrow temperature range in which a glass changes from a rubbery, soft plastic state to a rigid, brittle glassy state. Thus, the T g represents the point at which the material behaves more like a solid than a liquid. Question 11.65 Predict the coordination number for (a) BaO and (b) LiF. Ionic radii are Ba 2+ =0.143nm, O 2- = 0.132nm, Li + =0.078nm, F - = 0.133nm. Answer 11.65
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This note was uploaded on 03/01/2010 for the course MSE MSE 150 taught by Professor Dorothy during the Spring '10 term at Aarhus Universitet, Aarhus.

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Homework 4 Solutions - Homework #4 Solutions Chapter 11...

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