Book cover for Materials Science and Engineering: An Introduction

Materials Science and Engineering: An Introduction

William D. Callister, Jr. David G. Rethwisch

ISBN #9780471736967

7th Edition

771 Questions

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Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This section covers the fundamental structures and properties of ceramics, emphasizing their complex crystal structures derived from ionic and covalent bonding. It explains how factors like the cation-to-anion ratio, coordination number, and defect structures (Frenkel and Schottky defects) influence physical properties such as density, strength, and fracture behavior. Additionally, the text discusses silicate ceramics, various forms of carbon, and the impact of microstructural features like porosity on the mechanical performance of ceramics. Finally, the section covers methods to evaluate and predict ceramic behavior via phase diagrams and mechanical testing techniques.

Learning Objectives

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Key Concepts

CONCEPT

DEFINITION

Ceramics Fabrication Techniques

The methods and processes used for shaping, forming, and consolidating ceramic materials into final products with desired properties.

Example Problems

Example 1

For a ceramic compound, what are the two characteristics of the component ions that determine the crystal structure?

Example 2

Show that the minimum cation-to-anion radius ratio for a coordination number of 4 is 0.225.

Example 3

Show that the minimum cation-to-anion radius ratio for a coordination number of 6 is $0.414 .[$ Hint: Use the NaCl crystal structure (Figure 12.2 ), and assume that anions and cations are just touching along cube edges and across face diagonals.

Example 4

Demonstrate that the minimum cation-toanion radius ratio for a coordination number of 8 is 0.732

Example 5

On the basis of ionic charge and ionic radii given in Table $12.3,$ predict crystal structures for the following materials: (a) $\mathrm{CaO},$ (b) $\mathrm{MnS}$ (c) $\mathrm{KBr},$ and (d) $\mathrm{CsBr}$. Justify your selections.

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Step-by-Step Explanations

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Common Mistakes

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