It turns out that the bonds of carbon may have a

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: depending on the conditions under which the bonds were formed. In the case of graphite, the primary bonds exist within a plane; the carbon atoms lying within a single plane are strongly bonded in a two-dimensional network while the forces holding adjacent planes together are rather weak. A structure is thus formed in which adjacent planes can easily slide over one another and the material in this form exhibits good lubricating properties. On the other hand, if high temperature and pressure are exerted upon this solid, the character of the bonds changes to a three dimensional structure. The bonds of the carbon atoms take on a shape akin to toy jacks. These “jacks” bond together in a three-dimensional network to form diamond, the hardest material known to man. It is possible to produce diamonds commercially and such diamonds are used in drill bits for drilling through very hard minerals as well as for other kinds of cutting tools. In this chapter we shall study the basic principles of bonding and examine some of the relationships between the underlying bond character and material properties. | v v 23 | e-Text Main Menu | Textbook Table of Contents pg024 [V] G2 7-27060 / IRWIN / Schaffer 24 Part I pgm 1-14-98 plm 3-21-98 MP Fundamentals body-centered cubic (BCC) A cubic structure in which atoms are located in the corners of the unit cell | | e-Text center of | Textbook Table of Contents plus one in the Main Menu the cubic unit cell. v a vinyl polymer whose side ioned during polymerization. v measure of the amount of athermal Describing a phase transformation that is not 2.1 INTRODUCTION arent material, expressed in thermally activated. That is, the extent of the reaction is Have you wondered why metals are good electrical conductors while ceramics and not a function of time, but depends on temperature. The plastics are generally good insulators? Why does rubber stretch while metals are relatively martensite to an applied force? Why is diamond able to cut urity level within the band gap rigid in response tran...
View Full Document

This note was uploaded on 02/25/2013 for the course PHYS 2202 taught by Professor Sowell during the Spring '10 term at Georgia Tech.

Ask a homework question - tutors are online